The music that always came into Latte's head when a wild WHATEVER turned up had started playing, but it had a... stuttering feel to it. The shape came forward. It looked... like a weird tetris block. A backwards L, but chunky. And gray. And covered in... circuits? Scars? Orifices? Looking at it made his eyes hurt, and he had to look away. It seemed to fill up more space than it could, and it seemed to have only two dimensions, while at the same time having multiple features beyond his comprehension. Latte had read H.P Lovecraft. It seemed that Lovecraft had it wrong; the mind just couldn't see the horror that was there, but rather than seeing tentacles and mouths and goo it just put in something to fill the blank. Or was that what Lovecraft had said? His head hurt, like it was leaking out through his eyes. His eyes hurt, too.
Send something out. Fight it off for a while. Run.
'Go, Lapras!' said Latte, making that grave mistake that one in his situation might make. You shouldn't try to attack the cosmic horror with the thing you're riding on. He dived off Lapras, hitting the water with just enough time to turn and see...
His Lapras flickered and turned into a charizard. Latte, dumbfounded, checked his Pokédex. CHARIZARD M, it said. The Charizard folded inwards and vanished. 'MISSINGNO' was getting closer to him.
Latte now panicked, feeling that this was the appropriate course of action given his current situation. He pulled open his bag, looking for something, some means of escape. His bag was full of Master Balls.