Bulbasaur

Overgrow: When Bulbasaur is at a third of maximum hp, it gains advantage on all attacks for one hour.

Chlorophyll: During bright sunlight, Bulbasaur doubles it's speed.

Hit Points: Hit Point Die Count increases by 1 every 3 exp counters Bulbasaur has.

Evolve: Each time Bulbasaur defeats an enemy, it gains a exp counter. When Bulbasaur reaches 16 exp counters, it can evolves into a Ivysaur.

 Bulbasaur may only have 4 actions action of the given list.  Once a action is forgotten it cannot be relearned.

Any actions that have a limit may be recovered by a long rest

Tackle (1st level). Melee Weapon Attack: +3 to hit, reach 5 ft., one target. Hit: 3 (1d4+3) bludgeoning damage. 

Growl (2rd level). All targeted creatures within 30 feet must make a DC 13 Wisdom saving throw or gain disadvantage on their next attack roll on a failed save.

Leech Seed (7th level). Target enemy creature within 10 feet must make a DC 13 Wisdom saving throw or be embedded by a seed on a failed save. An embedded creature loose 4 hit points at the start of its turn and Bulbasaur regains 2 hit points. The target can repeat the saving throw at the end of its turn, losing the seed on a success.

Vine Whip (9th level). Melee Weapon Attack: +3 to hit, reach 5 ft., one target. Hit: 3 (2d4+3) bludgeoning damage. 

Razor Leaf (12th level). Ranged Weapon Attack: +5 to hit, range 15/30 ft., one target. Hit: 5(1d6+3) slashing damage. Attack critically hits on 19-20 rolls.

Take Down (15th level). Melee Weapon Attack: +5 to hit, charges 10 ft., one target. Hit: 5 (1d8+3) bludgeoning damage but Bulbasaur takes 1/4 of the damage as recoil.

Seed Bomb (18th level). Ranged Weapon Attack: +5 to hit, range 20/40 ft., one target. Hit: 7 (1d8+3) poison damage.

Sweet Scent (21st level). All enemy creatures within 30 feet must make a DC 13 Wisdom saving throw or be charmed.

Growth (25th level). As a bonus action, Bulbasaur can add an additional damage die to its next action.

Synthesis (Limit 2) (27rd level). Bulbasaur heals its injuries. Recover half of Bulbasaur's hit points.

Double-Edge (33th level). Melee Weapon Attack: +5 to hit, charge forward 10 ft., one target. Hit: 7 (1d12+3) Bludgeoning damage but Bulbasaur takes 1/4 of the damage as recoil.

Solar Beam (Limit 2) (36th level). Ranged Weapon Attack: +7 to hit, range 20 ft., Hit: 7 (3d8+3) poison damage. Bulbasaur charges up his action when used.  On his next turn Bulbasaur cannot move and unleashed the Solar Beam in a 20 ft line hitting ally and enemy creatures.