SilverAngelus

OK. In-game Teams just want to have good synergy / coverage. There really isn't a need for dedicated walls. I would say the best Pokemon to look for are those that are fast and initially strong, or those that have more bulk and power, but at the cost of Speed. Set-Up moves (Swords Dance and Calm Mind) are generally great as well).

I remember having Blaziken in one run with the Speed Boost ability, and boy did he save me a whole lot of times. But considering I already had Blaziken, I don't him I'll have him this time. I think I'll choose Typhlosion or Empoleon this time.

Synergy. Synergy Synergy Synergy. that's the most important part. your team has to work well together. let's give the reborn champ example @Zarc and name Gardevoir and Magnezone. their type coverage for each other is incredible, thus they work greatly together.