His recovery is awkward to edgeguard but it is quite possible. I was referencing this before. Ones that stand out to me are when MKLeo gimped him at 0 with guns (they stop pac's ascent AND shoot the trampoline to red.). The same thing can happen with Pika's bair, its an odd angle but the risks aren't really that bad as long as you don't get Side special's you're only taking a weak trampoline.
He has some really nice things like how straight down spikes will send him into the trampoline and he will bounce again safely... but it really isn't as good as people make it out to be. If he has to use the third bounce to make it up (which is almost always the Pac's fault, he does have massive distance on his side) you should always be able to get him by airdodging through him and then bouncing off the trampoline.
You can stop his side B by hitting him or the pellets.
Really what makes it seem so good is that he gets a charge off of recovery, if you get hit by power pellet you die really early, it can move him wherever he wants really... but not safely. Its time to start challenging that **** more, character dependent.
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Generally, recovery effects matchups in a specific way too much to say a blanket statement besides 'good recovery helps viability' which is kinda obvious.
The two biggest factors are obviously interactions that can lead to a gimp, such as how good you are off a rockcrock… but the other thing is how easily you set up the edgeguard. Like Snake, he is edgeguardable sure but honestly its hard to get a clean hit and set up without blowing up a grenade, having a c-4 you have to consider, him dropping a nikita… and his really really strong aerials. He can slap you out with a bair, maybe uair you at last hit situations, dair makes him float a lil... and if you get fair'd trying to get him low you are very dead, at very low percent... from like the top of the arc too lol.
This is why very gimpable characters hate pika so much. more than his ability to edgeguard, he can get you out there at the click of a button. Get bair'd in the middle of a (small) stage at 0 and suddenly you're offstage at 35%...
An example of specific interaction I know is moves that trade with pika bair and you die (armor nair with Yoshi, falcon dive)… and whether or not you clank out mega's dair. But to answer the hypothetical, I think we will see as people learn Pac more that his recovery is exploitable, and how we can abuse that and how it effects his MUs. His aerial hitboxes size stands out more as a problem to me, trying to get through Palu for example looks rough.