Crobat is best played as a stall breaker:
-Brave Bird
-Defog
-Roost
-Taunt/Toxic
Nature: Jolly
EVs: 168 HP/136 Atk/4 SDef/200 Spe
Item: Black Sludge
Ability: Infiltrator
Greninja should always use the Protean ability, a Hasty/Naive nature and 4 Atk/252 SAtk/252 Spe.
Let's face it; Machamp got outclassed by Conkeldurr in Gen V because the latter has more Attack and better all-round bulk than the former. Conkeldurr is the better choice:
-Drain Punch
-Mach Punch
-Knock Off
-Ice Punch/Thunder Punch
Nature: Adamant
EVs: 252 Atk/8 Def/248 SDef
Item: Assault Vest
Ability: Guts
or
-Drain Punch
-Ice Punch
-Thunder Punch/Poison Jab
-Mach Punch/Earthquake
Nature: Adamant
EVs: 108 HP/252 Atk/104 SDef/44 Spe
Item: Life Orb
Ability: Sheer Force/Iron Fist
or
-Bulk Up
-Drain Punch
-Ice Punch/Knock Off
-Mach Punch/Poison Jab/Knock Off
Nature: Adamant
EVs: 252 Atk/4 Def/252 SDef
Item: Leftovers
Ability: Guts
Venusaur has a better Grass STAB to use in Giga Drain. Razor Leaf just won't cut it:
-Giga Drain
-Sludge Bomb
-Earthquake/Leech Seed
-Synthesis
Nature: Relaxed/Bold
EVs: 252 HP/88 Def/168 SDef or 252 HP/252 Def/4 SDef
Item: Venusaurite
or
-Giga Drain/Leech Seed
-Sludge Bomb
-Hidden Power (Fire)
-Synthesis
Nature: Modest
EVs: 252 HP/4 Def/252 SAtk
Item: Venusaurite
You're not using Gengar to its full potential, which is a speedy special attacker. Its defenses are too low for any form of support, and it's massive Taunt bait:
-Shadow Ball
-Sludge Bomb/Thunderbolt
-Focus Blast
-Destiny Bond
Nature: Timid
EVs: 4 HP/252 SAtk/252 Spe
Item: Life Orb/Focus Sash
or
-Substitute
-Shadow Ball
-Focus Blast/Pain Split
-Disable/Will-o-Wisp/Focus Blast
Nature: Timid
EVs: 4 HP/252 SAtk/252 Spe
Item: Black Sludge/Life Orb
If you want a better annoyer, use Sableye:
-Taunt
-Will-o-Wisp
-Recover
-Foul Play/Knock Off
Nature: Calm/Careful
EVs: 252 HP/4 Def/252 SDef
Item: Leftovers
Ability: Prankster
Your variant of Espeon is best off in dedicated Baton Pass teams, IMO; this team isn't one:
-Reflect
-Light Screen
-Psychic/Psyshock
-Hidden Power (Fire)/Dazzling Gleam/Baton Pass
Nature: Timid
EVs: 252 HP/4 Def/252 Spe
Item: Light Clay
Ability: Magic Bounce
or
-Psychic/Psyshock
-Dazzling Gleam
-Shadow Ball/Hidden Power (Fighting/Ground/Fire)
-Grass Knot/Shadow Ball
Nature: Timid
EVs: 4 HP/252 SAtk/252 Spe
Item: Life Orb
Ability: Magic Bounce