Pikachu (PM) - SmashWiki, the Super Smash Bros. wiki

Pikachu is a playable character in the Brawl mod Project M. For its appearance in Project M, it was mostly reverted to its Melee version, while keeping a few techniques and moves from its Brawl and Smash 64 versions. Pikachu ranks 23rd out of 41 on the official tier list, close to the bottom of B tier

Bowser (PM) - SmashWiki, the Super Smash Bros. wiki

Wario (PM) - SmashWiki, the Super Smash Bros. wiki

Squirtle (PM) - SmashWiki, the Super Smash Bros. wiki

Super Smash Bros Melee Battle Cards! There isn't a ton of info on this official promo from a 2005 UK magazine, and there were no high quality scans anywhere, so I did

Reading the Alternate Costumes page on the Smash Wiki is a jarring experience : r/smashbros

Pikachu, SmashBrosCrusade Wiki

Squirtle (PM) - SmashWiki, the Super Smash Bros. wiki

Pikachu, Smashpedia

Super Smash Bros. Melee - Animal Crossing Wiki - Nookipedia