Combee will not equip anything.
Gastly will equip an Exp. Share.
Embirch will equip a Lucky Egg, and use an EC bonus from it to reach 4 with the battle EC.
Because Combee has reached 6 EC, Gastly has reached 4 EC, and Embirch has reached 4 EC (thanks to Lucky Egg,) I will engage in a TRIPLE EVOLUTION.
Vespiquen

Vespiquen [FLADoS] (F)
Nature: QUIRKY
Type: Bug/Flying
Bug: Bug STAB; More mobility in dense brush or forest conditions. Gain an extra guaranteed attack on multi-hit moves.
Flying: Flying STAB; immunity to Ground attacks outside extremely odd circumstances even for ground-based flying Pokemon. Enhanced aerial mobility. Superior senses in open air arenas.
Abilities:
Ability 1: Pressure: (Innate) This Pokemon’s presence fills the air with intense anxiety, and any damaging or status attack launched at this Pokemon costs the opposing Pokemon two (2) more energy to perform.
Ability 2: Unnerve (Innate, DW not yet unlocked) The Pokemon's presense causes immense tension in the opponent, preventing them from eating a held Berry. Natural Gift may still be used.
Stats: 70/80/102/80/102/40
HP: 100
Atk: Rank 3
Def: Rank 4
SpA: Rank 3
SpD: Rank 4
Spe: 40
Size Class: 3
Weight Class: 3
Base Rank Total: 19
EC: 6/6
MC: 6
DC: 4/5
Attacks:
Sweet Scent
Gust
Bug Bite
Poison Sting
Confuse Ray
Fury Cutter
Defend Order
Pursuit
Fury Swipes
Power Gem
Heal Order
Ominous Wind
Tailwind
Air Cutter
Total Moves: 14
Haunter

Haunter (Fear) F
Nature: Hasty (+15% Speed, +21% Accuracy (110^2/580 rounded to the nearest percent), -1 Def)
Type: Ghost/Poison
Ghost: Ghost STAB; brief intangibility that nullifies Normal and Fighting-type attacks. Can move through walls for a brief period of time but must remain in motion. Superior senses in low light and inside dark buildings. Have no vision reduction in hazes.
Poison: Poison STAB; immunity to Poison/Toxic, see and breath through smog/smokescreens/haze uninhibited. Able to use Wrap and Bind without losing focus. Superior senses in urban settings.
Abilities:
Levitate: (Trait) This Pokemon naturally floats above the earth when released or easily takes flight, evading Ground moves like Bulldoze, Dig, Earthquake, and Magnitude. Other Ground moves can still hit. Levitate Pokemon will retain the Levitate trait when they use Skill Swap on an enemy, and will steal the opponent's ability (the user can specify if they want a foe or ally to gain Levitate from a Skill Swap.) If a Pokemon with Levitate uses Role Play, they will copy the opponent's abilities and retain Levitate.
Stats: 40/45/40-/115/55/95+
HP: 90
Atk: Rank 2
Def: Rank 1 (-)
SpA: Rank 4
SpD: Rank 2
Spe: 110 (+)
Size Class: 3
Weight Class: 1
Base Rank Total: 15
EC: 4/9
MC: 0
Moves:
Hypnosis
Lick
Spite
Mean Look
Curse
Confuse Ray
Night Shade
Sucker Punch
Shadow Ball
Destiny Bond
Shadow Punch
Disable
Perish Song
Ice Punch
Toxic
Venoshock
Psychic
Protect
Taunt
Flarelm

Flarelm (F) Forest Fire
Nature: Brave (+1 Atk, -15% Speed, -10% Evasion)
Type: Fire/Grass
Fire: Fire STAB; immune to burn, emit a low glow in dark places, takes additional damage if active open flames are exposed to a water attack. Superior senses in volcanic or brushfire areas.
Grass:Grass STAB; Immunity to Leech Seed and Worry Seed. 50% reduction in status effect chance of oncoming "powder" attacks. More mobile in areas with strong natural light sources. Superior senses in tall grass and forest areas. Able to use Wrap and Bind without losing focus
Abilities:
Leaf Guard: (Innate) In bright sunlight the Pokemon is surrounded by a faint green glow. The glow protects it from all permanent and temporary status conditions.
Battle Armor: (Innate) This Pokemon’s thick armor prevents it from taking critical hits.
Chlorophyll (DW, not yet unlocked): (Innate) During bright sunlight, this Pokemon’s cells absorb more solar energy, doubling (x2) their speed.
Stats: 90/55(+)/85/80/70/55(-)
HP: 100
Atk: Rank 3 (+)
Def: Rank 3
SpA: Rank 3
SpD: Rank 3
Spe: 47 (-)
Size Class: 3
Weight Class: 4
Base Rank Total: 16
EC:: 4/9
MC: 0
DC: 3/5
Attacks:
Bullet Seed
Sweet Scent
Absorb
Growth
Ember
Leech Seed
Flame Wheel
Giga Drain
Fire Spin
Earth Power
Aromatherapy
Light Screen
Toxic
Rock Slide
Protect
Will O Wisp
Endure