I play a lot of Pokemon Showdown, especially Hackmons. I've found a way to get past most of the bans. Most of the banned abilities, other than Wonder Guard and Arena Trapand maybe one or two others, are all accessed through mega evolutions. You simply need to mega evolve the Pokémon necessary to get the ability. For example, I commonly use Gengar for this exact reason. Since I'm almost positive that nobody has discovered this before, I know that shadow tag will keep them from switching. I then have spore, leech Seed, topsy turvey, and cosmic Power. It's a very useful strategy. Anyway, if you want to get those abilities that are banned, then that's how.