the most powerful Pokemon is the alpha Pokemon arcues
this is debatable since different Pokemon have different stats, even with the same kind, also the moves used and strategy by Pokemon/trainer have a lot to do with it, but arceus is widely considered the best, it is only available by cheats or events, not in the game.
Arceus
Caterpie
Arceus is the most powerful, with a base stat total of 720, the current highest. sds ooo
The most powerful water type is Suicune.
The strongest (most powerful) Pokemon is of course rayquaza.
Kyogre.
dragonite
Arceus
Mew
mewtwo
NO. Only ash got that as a choice. You have to catch it in the viridian forest, but it's rare
Yes Ditto is the most powerful unstoppable at lvl 90-100