hint: 1st to ever do it. Now everyone does it. It’s “natural”
good luck
Azuril?
your on right track but no
Marill? 
nope
Lucario?
Meditite
nope, nope.
Deoxys? He was the first to change formes if Im not mistaken
Seedot?
Medicham
3 no’s
another hint: my shiny and normal form are very hard to spot the differences.
I could of been ash’s pokemon.
Plusle
nope
Well thats unfair I havent seen much of the anime for a reason
Gengar?
nope
i could of been Ash or Brocks pokemon.
Togepi
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Sudowoodo!
Yeah that’s probably it
IT is PIKACHU I aM cerTAIN