A Master Ball was a Master Ball, regardless of its origins, right? And MISSINGNO was a Pokémon. Of, course it was, everything that was alive and not human or a tree was a Pokémon. And a Master Ball was a Master Ball.
Latte threw the ball with admittedly weak force. It plipped into the water. Bugger. MISSINGNO was on top of him now, looming over him like a... tetris-block horror from dimensions unknown. It was rather good at looming this way, for rather obvious reasons. Latte threw his open bag at it.
~WILD MISSINGNO WAS CAUGHT:''.++++[[][[]][+M
'What?' said Latte, looking down at his 'dex.
WILD MISSINGNO WAS CAUGHT. Would you like to give a nickname to caught MISSINGNO?
'Er, no, thanks. I think I just died.'
Latte awoke the next day in his bed. There was a Master Ball sat on the desk beside him. Oh dear. Latte looked outside, and the sky was... empty. He couldn't see the sun, and nothing on the ground seemed to have a shadow. Huh. Latte frowned to himself. He knew something was amiss. Of course who could he talk to? His mother was out of town, his father was never mentioned in the plot so he had no idea about him, and he didn't really have any friends, what with being a bit of a snarky bastard.
Since a new paragraph requires some action, he decided to get up and get dressed. His Pokémon weren't in their usual places. He couldn't find his balls, subtext duly noted. Right, that did it, and Latte threw open his bedroom door...
And saw his garden. His bedroom now led to his garden. Why was this? His window said he was still on the second floor, which was quite disorientating. Well, heading into the crazy teleporting garden was probably a bad idea, so Latte decided to escape via the window. He could probably reach a tree or something.
He heaved his window open, and found that despite the view through the glass being of his town, the actual gap led to his basement. This was, as they say, 'bad'. So, that weird Pokémon horror thing was warping reality, was it? Or was he going mad?