Charizard

Illumination. Charizard sheds bright light in a 90-foot radius and dim light in an additional 90 feet.

Water Susceptibility. For every 5 feet Charizard moves in water, or for every gallon of water splashed on it, it takes 1 cold damage.

Super Firepower. If the dragon is hit by an attack that deals fire damage, the dragon's attacks that deal fire damage do +8 fire damage. 

Legendary Resistance (1 Day). If the dragon fails a saving throw, it can choose to succeed instead.

Multiattack. Charizard makes three attacks: two with its claws and one with its bite or tail.

Bite. Melee Weapon Attack: +9 to hit, reach 10 ft., one target. Hit: 14 (2d10 + 4) piercing damage plus 7 (2d6) fire damage.

Claw. Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 12 (2d8 + 4) slashing damage

Tail. Melee Weapon Attack: +9 to hit, reach 15 ft., one target. Hit: 16 (2d12 + 4) fire damage.

Thunder Punch. Melee Weapon Attack: +3 to hit, reach 10 ft., one target. Hit: 2d8 thunder damage. PP. 15

Fire Spin. Ranged Spell Attack: +3 to hit, reach 25 ft., all in range. Hit: 1d6 fire damage. Every time you use this attack, it does an extra +1 damage. PP. 10

Flamethrower. The dragon exhales fire in a 5 by 80-foot line. Each creature in that area must make a DC 15 Dexterity saving throw, taking 4d6 fire damage on a failed save, or half as much damage on a successful one. PP. 5

Air Slash. Ranged Spell Attack: +2 to hit, range 40 ft., Hit: 2d4 slashing damage. PP. 15

Blast Burn (1/day). Charizard exhales fire in a 30 foot cone. Each creature in that area must make a DC 15 Dexterity Saving throw, taking 35 (10d6) Fire Damage on a failed save, or half as much on a successful one. 

Death of flames. All players attacking this creature take 25 damage once it is defeated. 

Blaze Body. Charizard's flame burns with such intensity that it creates an aura of heat in a 20-foot radius around it.  When a creature enters this zone or starts its turn in it, the creature takes 8 (2d8) fire damage.

Blaze. For every 9 hit points that is delt to it, it's attacks do and extra 2 fire damage.

The dragon can take 2 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature's turn. The dragon regains spent legendary actions at the start of its turn.

Evolve. All attacks are mad with an added +15 to hit and +20 damage. This can be used once a week

Dragon Multiattack. The dragon makes a Strength check. If successful, the dragon makes 3 attacks, two with its Dragon Claw and one with its Dragon Pulse.