About time I got around to writing this one.
Petilil – Top Tier
Availability: Castelia City park via the sewers in White 2, in-game trade for a Cottonee north of Castelia in Black 2
Stats: Fantastic special attack and speed, with its decent bulk Petilil can easily set up a sleep powder or even quiver dance.
Typing: Grass is ass, no doubt about it. This is still a great Pokemon but it can by no means solo the game.
Movepool: Petilil follows a great tradition in grass types at having awful coverage. But you have sleep powder for anything you know you can’t hit. Using Quiver Dance then Giga Drain followed by some Petal Dances will eliminate most of the Elite 4 and anyone else foolish enough to stand in your way. If your Petilil has Own Tempo (which in Black 2 it always has) you will destroy everything with the grass version of outrage.
Major Battles: Petilil has problems against Burrgh and his bugs, and Elesa carries a good amount of flying and fire moves which will be a pain. Clay gets trounced by you. Skyla also can ruin you when she isn’t using her ducks. Drayden can be beaten with Quiver Dance easily, and Marlon kneels before you. The key with Petilil even against things that may hurt you is that you can easily sneak in a Quiver Dance or two then the game can almost go into autopilot while you Petal Dance.
Additional Comments: The best grass mon in the game. The Black 2 ingame trade has a timid nature great IV’s as well with Own Tempo so Petal Dance never confuses you. With the extra exp as an ingame trade Petilil won’t mind if it’s benched for some gym battles while you other mons get a chance to level up. Get the Sun Stone from the Volcarona chamber. You will probably have to use the move relearner to get Quiver Dance which is learned by Liligant at 28 but it is worth it.
During the holiday I'll see about running White 2 with anything still needing to be placed.