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Smash Cadet
Just one thing, Pikachu can actually QAC in front of his tjolt.No one in the game has a projectile that they travel faster than, even with glide-tossing.
And as for the overall matchup, coming from a Pika player, dolphin slash is very effective at punishing... Especially on stages with platforms (middle of BF is the best) as Marth can land safely after using it.
Dancing blade is also great for building up damage if your opponent has slight lag, but it can be punished if Pika spotdodges and ends up behind Marth, and it can sometimes be shieldgrabbed.
Sometimes Pika will tjolt you when you're recovering, so save your jump to avoid that, or use upb early.
I like to grab with Pika, and there are quite a few follow-ups after an fthrow, like short-hopped fair, sliding usmash, or even a running grab if Marth doesn't jump (or possibly just DI backwards). I'm not sure but it might be possible fair a Pika approaching after his fthrow, so that might make some of these ineffective.
Also, if you're being fthrown or bthrown off the edge, a thunder might be coming.
Spacing is the key though. Fair and jab can cancel tjolt, so it's fairly easy to approach, but if the Pika is good at QACing then it'll be a lot harder.
Feel free to correct me if I'm wrong, this is all just from what I've experienced (which isn't a whole lot, but I'll contribute what I can).