For people advocating complex bans in this case instead of banning Liepard. I'd like to remind you all that our policy is that we ban a move, ability or combo only if it's broken on ALL users of that combo, but it is perfectly legitimate to ban a single Pokemon even if only one of its sets are "broken."
Just thought I'd point out that Liepard is literally the
only Pokemon (other than Purrloin, who does the same thing but slighly less effectively) able to use the Prankster + Assist combo, since no other Pokemon who learns Assist has Prankster. That technically means that
every Pokemon who uses Prankster + Assist is broken (or so many of the people on this thread seem to think.)
Personally, it seems to me like a complex ban for a single Pokemon is uncalled for, but the fact remains that the only other Pokemon we have to compare Prankster + Assist Liepard to is Purrloin, which is a bit unfair if you think about it. Since there are no other Pokemon able to use Assist + Prankster, we have nothing to gauge it against (Like Speed Boost + Baton Pass Ninjask compared to Speed Boost + Baton Pass Blaziken) and thus have no idea if the combination would be just as broken on another Pokemon or if it would be mediocre.
We've already agreed that Prankster in and of itself isn't broken, and that Assist is also not broken either. The combination of these two however, is, but because only one line of Pokemon can use it, it seems strange to advocate a complex ban on something that effects just two Pokemon. We also have the issue that many people here like Liepard and believe that it's other sets (not Assist or SwagPard) are very healthy for the metagame. So what would be the simplest thing to do in this situation? The obvious, and easiest choice is to ban Liepard itself, since it is the vehicle for the broken set (Assist + Prankster) that only it can use. However this wouldn't even be an issue if a totally uncompetetive move like Assist were banned in the first place. While it certainly isn't broken, it's a completely irrelivent move when used on any team but one revolving solely around it. No skilled player would use the move on a well constructed team, but it's broken on teams that focus solely on using it to spam priority phasing. If that isn't telling of Assist being unhealthy for the tier, than I don't know what is.
What I'm trying to get at is that we should be focusing on what actually makes this game
fun. I know that Assist wouldn't even be brought up unless Assist Liepard hadn't started gaining popularity, but now we can take a look back at why we banned certain moves in the first place and realize that Assist fits most of the criteria for why there's no Double-Team, Sheer Cold or Guillotine. It's not fun to play against, takes no skill to use and it drags the metagame down when it's abused. Liepard is beloved by many different players, myself included, and banning it because it gets one single uncompetetive move that no other Pokemon can even use reliably seems like a real waste.