its been quite said that pt is gonna b 1 char, and no ivysaur is a purely defencive person...
yoshi absolutely fits the description completely and betterly than any1 else
ike: not all his b's r useful. sideB is horrendus vs any1 whos ever played vs ike b4. it gets sheildgrabbed every time on the floor, u die when some1 takes the hit offstage, and u die vs ddd if hes using B. his downb is quite useful but thats undebated and not completely nessesary for u to b good @ him. his b is ok if u know how 2 use it but fsmash takes its place in terms of charge up moves, and b is rly only good as an airial mix up. his upb is a normal vertical recovery move ands extremely punishable if u miss w/it (and its got horrible range) onstage.
bowser: his b is unessesary imo, his upb is normal horizontal recov and is too weak to bother w/for onstage mixup, his downb is way too slow, however his overb is a huge part of bowsers game... BUT the hint was plural when refering to the chars b moves.
also, both of those chars have a decent defencive game and are lucky if they get to play it, and in no way are they put on a huge disadvantage by being put on d...
yoshi has the worste defencive options in the game, 1 of the worste recovs in the game as its still a second jump based one as although hes got good di hes no jiggly, all of his aproaches ud better hit w/or ur getting punished, on the surface all of his b's suck alot but u do gotta use them, and hes by far lower teir than almost every char as hes like falcon and is a joke char.
also, IKE AND BOWSER HAVE NO CHANCE VS MK, YOSHI ON THE OTHER HAND HAS A CG VS MK