Perfect Giratina CP Pokémon GO will help you pick out the strongest Giratina you've caught during Raids. Here's how to check your Giratina for perfect CP.
Perfect Giratina CP Pokémon GO: How to Check
The game calculates CP based on the Individual Values (IVs) for each stat. You can find an individual Pokémon's stats when you take it to your team leader for appraisal.
The other form of Giratina, Altered Forme, has marginally higher CP at 3,379. Giratina is one of the strongest Pokémon in the game, with either form dominating the Ultra and Master Leagues. They're both so powerful, they actually compete with each other over which is better. Both of Giratina's types are weak to themselves.
The defense-oriented Altered Forme performs slightly better in the Ultra League than the Origin Forme, but the roles are swapped in Master League. The difference between them is marginal, so you can't go wrong with either. Just make sure your Giratina is in top condition before devoting resources to it.