Hey, I just had the amazing idea to make a team using only the new generation of pokemon (not so amazing after all). Any help would be appreciated
Greninja w/Life Orb
252 Spe / 252 SpA / 4 Hp
Timid nature
Protean
Scald
Dark Pulse
Ice Beam
Grass Knot
Talonflame (no item)
252 Spe / 252 Atk / 4 Hp
Adamant nature
Gale Wings
Flare Blitz
Acrobatics
Roost
U-Turn
Sylveon w/Leftovers
252 Spd / 52 SpA / 204 Hp
Calm nature
Cute Charm
Wish
Heal Bell
Moonblast
Light Screen
Furfrou w/??
4 Spd / 252 SpD / 252 Hp
Impish nature
Fur Coat
Cotton Guard
Thunder Wave
U-Turn
Return
Goodra w/Assault Vest
252 SpA / 252 SpD / 4 Hp
Modest nature
Gooey
Sludge Wave
Flamethrower
Ice Beam
Dragon Pulse
Aegislash w/Balloon or the berry that heals anything/burn
252 Atk / 252 Def / 4 Hp (0 speed IV's)
Stance Change
Brave
King's Shield
Shadow Sneak
Sacred Sword/Iron Head
Swords Dance
I'm not too familiar with the best use of items, although I'm confident in using assault best on goodra. Any input will be much appreciated

Greninja w/Life Orb
252 Spe / 252 SpA / 4 Hp
Timid nature
Protean
Scald
Dark Pulse
Ice Beam
Grass Knot
Talonflame (no item)
252 Spe / 252 Atk / 4 Hp
Adamant nature
Gale Wings
Flare Blitz
Acrobatics
Roost
U-Turn
Sylveon w/Leftovers
252 Spd / 52 SpA / 204 Hp
Calm nature
Cute Charm
Wish
Heal Bell
Moonblast
Light Screen
Furfrou w/??
4 Spd / 252 SpD / 252 Hp
Impish nature
Fur Coat
Cotton Guard
Thunder Wave
U-Turn
Return
Goodra w/Assault Vest
252 SpA / 252 SpD / 4 Hp
Modest nature
Gooey
Sludge Wave
Flamethrower
Ice Beam
Dragon Pulse
Aegislash w/Balloon or the berry that heals anything/burn
252 Atk / 252 Def / 4 Hp (0 speed IV's)
Stance Change
Brave
King's Shield
Shadow Sneak
Sacred Sword/Iron Head
Swords Dance
I'm not too familiar with the best use of items, although I'm confident in using assault best on goodra. Any input will be much appreciated
