Squirtle → Wartortle → Blastoise

1-cost marksman · Water · range 3 · #1 of 13 1-cost Pokémon in our tier list.

Synergies

Water Water types gain +6/24/30 extra Energy per attack. Active at 2 / 4 / 6. Other Water Pokémon: Magikarp, Psyduck, Poliwag, Slowpoke, Seel, Vaporeon, Lapras, Staryu, Shellder.

In Kanto Tactics each star level has its own ability. It casts on its own when Energy is full (+10 Energy per attack, more when hit).

Fires a jet of water at its target and withdraws into its shell, gaining a shield. Power 125.

Water · Special · 40 Energy (starts with 10)

Bubbles hit its target and those nearby, slowing them; then it withdraws into its shell and gains a shield. Power 246.

Water · Special · 55 Energy (starts with 10)

A jet that pushes its target back 2 hexes (if it collides, both are knocked airborne), then it withdraws into its shell with a shield. Power 943.

Water · Special · 85 Energy

Star	HP	Attack	Sp. Atk	Defense	Sp. Def	Atk speed	Crit	Range	Energy
★ Squirtle	811	79	68	60	60	0.89	6%	3	40
★★ Wartortle	1,224	122	105	78	78	1.06	6%	3	55
★★★ Blastoise	2,505	247	216	101	107	1.26	6%	3	85

Without items or synergies. A shiny copy (1 in 200 in the shop) has +10% HP, defenses and damage.

Squirtle as the carry of a full board, every 3-item combination of its class tested against the same field.

Items	Win rate
Choice Specs Life Orb Focus Sash	52%
Choice Specs Choice Specs Focus Sash	51%
Choice Specs Choice Specs Quick Claw	50%
Quick Claw Life Orb Shell Bell	50%
Life Orb Shell Bell Focus Sash	50%