I love the EEVEE/LUTION idea <3
It'd probably go like this on the B moves:
Eevee
Size-Small Weight- Light, Fast Faller Jump- Moderate Reach- Low without B attacks Strength- Low
B: Take Down- Eevee sprints quickly towards an opponent and knocks them into the air.
B>: Iron Tail- Eevee deals a powerful swipe with its tail, knocking opponents back at an angle.
B^: Quick Attack- Similar to Pikachu's B^ but with a shorter distance for balancing purposes.
Bv: Evolution Stone- Evolutionary Stone appears above head and Eevee cycles into Flareon.
Flareon
Size- Small Weight- Medium Jump: Low to Moderate Reach: Moderate Strength: Medium-High
B: Ember- Flareon fires a small burst of fire that goes in a straight line. Charging up results in a larger burst of fire.
B>: Fire Fang- Flareon lunges and tears at its foe dealing damage. Charging up results in a longer distance and increase in damage. Can be used as a recovery
B^: Fire Spin- Flareon spins and launches itself at an upward, spiral angle to recover, knocking opponents aside.
Bv: Evolution Stone- Evolutionary Stone appears above the head and Flareon cycles into Vaporeon.
Vaporeon
Size- Small Weight- Medium-Heavy Jump: Low to Moderate Reach: Good Strength: Medium
B: Brine- A blast of salty water knocks opponents away, growing larger as it is charged.
B>: Acid Armor- Vaporeon alters its cellular structures to repel projectiles and defend against attacks.
B^: Aqua Ring- Vaporeon surrounds itself with a ring of water to boost itself up, washing away nearby foes.
Bv: Evolution Stone- Evolutionary Stone appears above the head and Vaporeon cycles into Jolteon.
Jolteon
Size- Small Weight- Light, Floaty Jump- Moderate-High Reach: Decent Strength- Low
B: Thunder Wave- Jolteon fires a short range burst of electricity that stuns opponents for a second or two.
B>: Charge Beam- Jolteon charges up, firing a beam that bounces off of walls and shocks opponents. The longer the charge the more powerful.
B^: Agility- Jolteon moves at an incredible speed and moves foward to recover.
Bv: Morning Sun- Radiant sunbeams hit Jolteon and Jolteon cycles into Espeon.
Espeon
Size- Medium Weight- Medium Jump- Floaty Ness-esque Reach: Poor Strength: Medium
B: Psychic- Espeon fires a zig-zagging blast of pyschic energy. Charging up results in more distance and power.
B>: Reflect- Reflects projectiles and turns opponents around. Charging can result in a high knockback on an opponent or a 1.5x damage multiplier on a reflected projectile.
B^: Trick Room- Espeon enters another dimension and reappears shortly afterwards in the direction designated.
Bv: Moonlight- Full moon appears and Espeon cycles into Umbreon.
Umbreon
Size: Medium Weight: Surprisingly Heavy, Fast Faller Jump: Bad Reach: Good Strength: Good
B: Mean Look- Umbreon gives a nasty stare that paralyzes a nearby opponent for a second or two.
B>: Faint Attack- Umbreon quickly tears into an opponent. Charging up results in even more hits and knockback.
B^: Pursuit- Umbreon lunges foward a moderate distance and knocks an opponent down. Can be used for recovery.
Bv: Nature Power- A small patch of grass appears at Umbreons feet and it cycles into Leafeon.
Leafeon
Size: Small Weight: Medium, Fast faller Jump: Moderate Reach: Moderate Strength: Good
B: Leaf Blade- Leafeon charges up and delivers a devastating slash with it's leaf-like tail. Charging up results in even more knockback.
B>: Grass Knot- Leafeon trips up an opponent, knocking them down and holding them there for a second while dealing minor damage.
B^: Magical Leaf- Leafeon disappears in a sudden gale of leaves and reappears a decent distance in an indicated direction.
Bv: Blizzard: Snow appears at its feet and a chill wind blows, cycling Leafeon into Glaceon.
Glaceon
Size: Small Weight: Medium Jump: Bad Reach: Good Strenght: Good
B: Ice Shard- Glaceon fires an ice shard foward, slowing an opponent. Charging up results in more and larger ice shards, potentially freezing an opponent.
B>: Ice Beam- Glaceon shoots a wide, slow moving beam that can freeze an opponent and deal low damage. Charging up results in a thinner, faster beam that deals more damage.
B^: Icy Wind: Glaceon drifts foward quickly, born upon an icy wind that blows it foward.
Bv: De-Eeveelution: Glaceon reverts back to Eevee!