I am in the middle of making my first team and was hoping for some advice. It's to be an OU team, but it must include 1 from every gen, 1 Fossil, 1 eevee, abd 1 starter.
Here is what i came up with, but not sure if it has enough power to it and unsure about how i should use my fossil.

Greninja@ Focus Sash
Ability: Protean EVs: 252 Atk / 252 Spd / 4 HP
Jolly
Waterfall
Spikes
U-Turn
Taunt

Scolopede
Speed boast EVs: 252 HP / 4 SpD / 252 Spe
Jolly
Baton Pass
Protect
Swords Dance / Iron Defense
Substitute / Megahorn

Espeon @ Light Clay
Ability: Magic Bounce EVs: 252 HP / 4 Def / 252 Spe
Timid
Light Screen
Reflect
Baton Pass
Psychic/yawn

Rotom-W @ Chesto Berry
EVs252 HP212 Def44 Spe
Bold
Volt Switch
Hydro Pump
Will-O-Wisp
Rest

Gengar @ Life Orb
EVs 4 Def 252 SpA 252 Spe
Timid
Substitute
Pain Split
Shadow Ball
Focus Blast


Also, everyone post their teams and we all rate and give advice