Weak toGrass ×2.56FightingGroundElectric ×1.6

Attacker	Type	Moveset	DPS
Kartana	GrassSteel	Razor LeafLeaf Blade	58.7
Xurkitree	Electric	Thunder ShockPower Whip	50.3
Roserade	GrassPoison	Magical LeafLeaf Storm	50.0
Zarude	DarkGrass	Vine WhipPower Whip	49.0
Rillaboom	Grass	Razor LeafFrenzy PlantLegacy	48.5
Breloom	GrassFighting	Force PalmGrass KnotLegacy	47.6
Meowscarada	GrassDark	LeafageFrenzy PlantLegacy	47.3
Decidueye	GrassGhost	Magical LeafFrenzy PlantLegacy	46.6
Tapu Bulu	GrassFairy	Bullet SeedGrass Knot	46.4
Tsareena	Grass	Magical LeafGrass Knot	45.8
Sceptile	Grass	Bullet SeedFrenzy PlantLegacy	45.4
Ogerpon	Grass	Magical LeafGrass Knot	45.2

Clear boosts the Grass attacks above. Partly cloudy and Rainy boost Tirtouga.

Level 40, 15 attack IV, costed against Tirtouga's own defense and typing, one per evolution family.

Tirtouga's moveset, CP and shiny All counters Raid board

Questions people ask

What is Tirtouga weak to in Pokémon GO?

Tirtouga takes 2.56 times damage from Grass, and 1.6 times from Fighting, Ground and Electric.

What's the best counter to Tirtouga?

Kartana with Razor Leaf and Leaf Blade, worth 58.7 damage per second against Tirtouga's own defense. The full ranking is above.