You should look at rental teams on Global Link, especially Japanese teams, I feel like they'd be hardcore. Search around Smogon if you're wanting to play tiered stuff rather than just Battle Spot. It's hard to recommend a team without knowing what your style is. Smogon strategy entries are really useful. I'll give an example, this Togekiss was a favorite of mine last generation in doubles.
Togekiss @ Safety Goggles
Ability: Serene Grace
EVs: 236 HP / 192 Def / 20 SpD / 60 Spe
Calm Nature
- Air Slash
- Follow Me
- Thunder Wave
- Roost