- Uthrow, uair, dair, and usmash all charge solar beam if you hit with the bulb directly.
- Ivysaur's wavedash is good but it isn't necessarily vital to her game. Wavelanding is, however, so you should definitely try to get really good at that.
- Seed Bombs are good. You shouldn't use them in neutral because they have a ton of lag, but you can juggle people with them after a throw when uair won't reach and they're generally good for harassing opponents high up and away from the stage. If seed bomb connects on the way down in the air you can vine whip them if you're quick about it.
- Personally I still forget to solar beam a lot when I have the charge lol. Some good setups are:
-- dthrow -> solar beam (your most common one, if they di toward you you can just vine whip them instead)
-- dash attack -> solar beam (the easiest one to get along with dthrow)
-- uair -> solar beam
-- dair -> solar beam
-- dtilt -> solar beam
-- utilt -> solar beam
-- usmash -> solar beam
-- tipper fair -> solar beam
-- SOMETIMES vine whip -> solar beam (actually idk if you can still true combo this in 3.5 but even if they're out of hitstun as long as you get them before they get out tumble it shouldn't matter)
One other thing, if you're picking up Ivysaur make sure you master RAR. You should basically be able to do it as fast as possible on command. Ivy doesn't have too many reliable ways to KO outright so getting in a quick bair to set up for an edgeguard is crucial for closing out stocks.