This type of day in SIRS, rain or shine, was the typical day for the boys and their adoptive father for weeks. Many Pokémon attributed their gratitude for their rescues to Luke and Pikachu, and SIRS's investigation seemed to make headway, though Luke and Pikachu never got the details on it.

This often dismayed Luke and Pikachu, but they would comfort each other about it, whether whispering to each other at home when they were in their beds or when heading off on a mission.

"Chin up, Luke," Pikachu would say. "We'll be included in that investigation soon; I bet we'll be the ones to crack it!"

Luke would nod and say, Yeah. All in good time, I suppose. I just really want to help Dad.

He knew he would, and he smiled. Pikachu was always so positive and upbeat, and it was contagious; it was a far cry from what he used to be, according to others.

As it was, their adventures through Mystery Dungeons were interesting enough on their own.

Throughout their rescues, Luke and Pikachu occasionally took notice of Pokémon in Mystery Dungeons that shouldn't be in those particular ones: a dark blur raced in front of Luke and Pikachu at Tidal Beach that Pikachu was somehow able to identify as a Sneasel; the boys saw a Kirlia wading through the sands of the Desert's Dunes; and, though he never said anything to Pikachu, because it freaked him out so much, Luke ran into an agitated Riolu in the Dark Woods that attacked him and ran; it was just like him!

The boys decided to shrug these off for the time being, as sometimes, there were Pokémon that might appear on rare occasions in those dungeons. They'd say something if it became a problem.

Shortly after these incidents, on a seemingly typical day at the SIRS base, when the boys followed Lucario into the base, they met not just the normal SIRS agents, but four new Pokémon, as well.

This was addressed at the morning meeting.

"Everyone, we have four new agents joining SIRS today," Lucario announced. "They have passed the necessary tests and are prepared to take their oaths of secrecy. But before that, I'd like them to introduce themselves, for those that haven't met them." Lucario looked at Luke and Pikachu in particular, then turned to the new agents. "Introduce yourselves!"

A stout, gray Pokémon was the first to step forward to speak. "I am Donphan, he who rolls along the ground with incredible speed and the power of the earth! I protect the precious earth we stand on."

An imposing, dragon-like, furry Pokémon with strange ears and the ability to fly stepped forward and said, in a loud voice that made everyone clasp their ears, "Call me Noivern the Sonic Boom! I can monitor even the slightest sound from the air! I protect our sweet skies!"

A lovely Pokémon that seemed to glide on the air as if swimming said, in a soothing voice, "My name is Lumineon. I normally dwell in water, but can maneuver here on land as if I were swimming. As such, I protect the beauty of the seas. And now, our leader."

The leader was a tiny Pokémon. It looked like a green shrub covered in pink flowers, but seemed to contain enormous power. With a small voice, the Pokémon said, "I'm Shaymin. I am a Mythical Pokémon, and I am always seeking a perfect place overflowing with gratitude. My favorite flower is the Gracidea flower. Give me one and…I'll be so thankful! I protect the world's vegetation! Me and my friends here are a group of Pokémon that want to protect that which is the natural beauty of this world." Shaymin then walked over to Luke, pressed herself against Luke's leg, and laid on the ground, smiling and humming ever so adorably. Luke was overcome by the sweetness of this Pokémon.

"Now," Lucario said, not noticing Shaymin's behavior towards Luke. "These Pokémon protectors seem like competent warriors. We met during an investigative mission I carried out the other day. I ran them through the tests and they are ready to help SIRS in any way they can. I believe they will be incredibly beneficial to our investigation. Now, everyone, bear witness to their oath."

Shaymin rejoined her friends for the oath, and everyone approved their intent of oath, inducting them as members of SIRS.

"I have already briefed you four on your duties," Lucario said, indicating that these duties, pertaining to the investigation, were secret from the boys. "Why don't you take some time to get to know the other agents of SIRS?"

Shaymin immediately returned to snuggling against Luke's leg. Everyone noticed and chuckled at Shaymin's adorable behavior.

"Let me explain," Lumineon said. "As she said, Shaymin seeks out gratitude naturally; she is nourished by gratitude. For Shaymin to like you as much as she does…"

"…you've done so many good things for people," Shaymin said. "And they're all so thankful; I can feel their gratitude through your kindness."

Heh heh, Luke chuckled. It's not just me. It would never have been possible without Pikachu, over across from me. He pointed to his friend across the table.

"Yes…" Shaymin said. "I can feel it. The strong friendship you two have; Pikachu's gratitude to you for being his first true friend…your gratitude to Pikachu for helping you when you lost your memories."

Wow, Luke asked. Shaymin can pick up on all that from just hugging me like this?

"Shaymin IS a Mythical Pokémon," Donphan said. "She has awesome powers concerning stuff like this. She can tell who to trust."

"She is strongest and purest among us," Noivern loudly added. "This is why we answer to her."

Luke nodded. I think…I think we're going to be good friends, he said to the group, particularly Shaymin; the group reciprocated their agreement.

And so they were; over time, Shaymin, Lumineon, Donphan, and Noivern proved to be great allies and good friends to SIRS, and they fit in very well.

Noivern was very loud and could be obnoxious. However, no one seemed to mind; it was clear he meant well. In addition, Noivern was remarkably observant, particularly with sounds due to his enormous ears. Even outside of sounds, his keen observations impressed everyone at SIRS; he seemed to know everything about everyone, even things they wouldn't normally say aloud. He could tell they were all trustworthy through this, and proved to be thus in return with their secrets.

Donphan was stoic and tough. He was happy to smile and laugh, but he never seemed to exhibit anger…or sadness. He was very level-headed and kept everyone's feet on the ground (unless they could fly; it was a joke SIRS liked to make, and Donphan would chuckle along). In Mystery Dungeons, according to Lumineon, attacks hardly seemed to faze him; he would just withstand them and barrel along, rolling as he could.

Lumineon was very dainty and gentle; she spoke in a proper tone of voice and encouraged others to do the same. She was no slouch in battle, though; Shaymin said Lumineon would take the lead if she was struggling; Donphan and Noivern were tough, but needed guidance in battle, which is where Lumineon would come in. Shaymin also credited Lumineon as her personal confidante; as everyone figured out, Lumineon was remarkably wise. Her proper tone and wisdom sometimes made her seem snobby, but everyone knew she had good intentions.

Shaymin, as everyone caught on, was remarkably sweet, particularly to those who were full of gratitude, their own and others. Due to this, thanks to their rescue missions and the resulting gratitude from those they rescued, Shaymin was particularly fond of Luke and Pikachu. She was clearly a leader to her crew, though, in strength and leadership skills, and everyone respected her.

Indeed, they fit into SIRS and made good friends with everyone, and Luke was happy to have more friends he could rely on.