Disclaimer: Pokemon is not mine, Yadda, yadda, yadda ...
He'd never been trained, he had only his instinct and that was screaming at him to 'do something!' And he trusted his instinct with his life, had actually done so on a number of adventures – so he trusted it now as he grabbed Sir Aaron's gloves. Were he older, they would have fit as though they'd been made for him.
Hands thrust out toward Mew, he let his instinct guide him, pull the Aura from his inner well and manifest it around Mew. He had to save this tree and the pokemon within it!
Energy rippled painfully up his frame, with a grunt he shuddered and managed to maintain the Aura flow. He pushed harder, even with Lucario's help he knew it would be difficult.
Ash Ketchum had never had any training, he hadn't even known about Aura until he'd accidentally released Lucario. There had been no master to teach him to know his limits.
He passed them.
"Ash!"
"Pikapi!"
He fell to his knees and collapsed bonelessly onto the floor, vaguely aware of everything returning to normal before everything went black.
He'd been trained by the best.
His master had taught him to always know his limits, to sense the Aura in others. Lucario knew Ash was almost at the limit, and had planned on taking the burden on his shoulders alone. But without warning there had been a surge of Aura, and Ash had drained himself dry.
"Ash!" He'd cried in alarm.
"Pikapi!"
Ash fell to the floor and he knelt beside the boy, his ... friend. He would not lose another! He focussed what remained of his Aura as Mew healed the tree and let it flow through him. A gentle stream compared to the raging torrent of a minute earlier. Lucario used his Aura to re-ignite Ash's Aura and only stopped when it was strong enough to support life.
Ash would be okay.