Chu used to use Pikachu and Young Link against Peach because Ice Climbers vs Peach is a stupidly uphill match-up for Ice Climbers. As far as I know he goes all ICs now though.
Uhh, bad match-ups aren't really the killing factor for pocket characters because you pull them out to win a match-up. You don't revenge kill Heatrans with Scizors, but that doesn't make Scizor irrelevant. Similarly, you don't pick Falco against a Pikachu, but he's still damn good against a lot of other characters.Climbers lose to Peach, Falco losses to Pika and climbers, and D3 losses to Falco, Oli, and climbers. They all have bad matchups unlike mk and they will have some difficult times with certain matchups unlike mk who doesn't have to worry about ****.