It's not so hard to create a team using these pokemons.
M-Kang
Gengar
Rotom-W
Sylveon
Amoonguss
Bisharp
This is a good core mostly because they cover each other weaknesses and they can check a lot of things. The real problem is most teams in Battle Spot are built to counter this team, because it's so common.. so you may decide to use a strategy and build a particular team (such as a Rain team, a Sun team, a Trickroom team or a mixed one). Howewer i'm not saying that team is not usable.. if you have good prediction abilities you can run this team without many problems (but you should change some moves according to your team resistances and overall coverage)
M-Kang
Gengar
Rotom-W
Sylveon
Amoonguss
Bisharp
This is a good core mostly because they cover each other weaknesses and they can check a lot of things. The real problem is most teams in Battle Spot are built to counter this team, because it's so common.. so you may decide to use a strategy and build a particular team (such as a Rain team, a Sun team, a Trickroom team or a mixed one). Howewer i'm not saying that team is not usable.. if you have good prediction abilities you can run this team without many problems (but you should change some moves according to your team resistances and overall coverage)