If Kirby swallows one of the PTs Pokemon, does he turn into the PT and go into the background or just be a normal fighting Pokemon?
He turns into the pokemon. Look at the Special moves for Kirby on the site. He has the squirtle hat.
he will get the powers of whatever pokemon he seallows
(http://www.smashbros.com/en_us/characters/images/kirby/kirby_071220l-l.jpg)
see?