Looks like Reverb approved this so here we go!
Serperior @ Life Orb
Ability: Contrary
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
- Leaf Storm
- Dragon Pulse
- Hidden Power Fire
- Glare
Offensive Serperior can do a lot of damage, especially with a Life Orb attached. Great three move coverage makes this an easy piece to build around. All it needs is one good partner to really wreck some defensive cores and I think in an exercise like this that makes for a good starting point (and there's multiple good partners to pick from). Glare or Taunt is really personal preference in that you can either paralyze offensive switch-ins or stallbreak with Taunt. Versatility in roles is also important for this process as it allows us to adjust later on in the process. We can go with Glare unless we realize we don't have a stallbreaker and then flip to Taunt.
I personally would shy away from starting with a Mega early, as they can usually cover larger gaps later in the process. Not that there should be any rule or anything, but adding a bulky Venusaur, Scizor or Altaria later in the process (think teammate #4 or #5) could really plug a lot of holes, and if we choose to build around a DDer early (for an example) that could restrict us later in terms of covering holes.