Pokémon GO Trainers will be getting into tip top shape over the next month as they take on not 1, but 2 versions of the Legendary Giratina, when the Ghost/Dragon type returns to Tier 5 Gym Raids.
Altered Forme Giratina
From March 28th through April 2nd (4pm EST), the previously released Altered Forme of Giratina will reappear, giving new Trainers a chance to add this monster to their Pokédex and experienced Trainers the opportunity to capture one with better stats.
Best Moveset to Have:
Shadow Claw/Dragon Claw
NOTE: With this moveset, Altered Forme Giratina will be a terrific ally against Dragon types.
Hardest Moveset to Defeat:
The hardest Altered Forme Giratina to defeat will be one with the Dragon Breath fast move, most especially when paired with the charge move, Dragon Claw.
Counters:
Very Best:
Rayquaza: Dragon Tail/Outrage
Palkia: Dragon Tail/Draco Meteor
Salamence: Dragon Tail/Draco Meteor
Dragonite: Dragon Tail/Outrage
2nd Best:
Gengar: Lick or Shadow Claw/Shadow Ball
Dialga: Dragon Breath/Draco Meteor
Latios: Dragon Breath/Dragon Claw
Mewtwo: Psycho Cut/Shadow Ball
Perfect IV:
100% Altered Forme: 1931CP
100% Weather Boosted Altered Forme: 2414CP
Giratina is Weather Boosted in Windy and Foggy weather.
# of Trainers Needed:
If your group consists of strong, Level 35 and higher players who possess the best counters, then 3 Trainers should be enough.
If your group consists of Level 25 and higher players (who at least own a team of the 2nd best counters), then 4-5 Trainers should work.
Origin Forme Giratina
From April 2nd (4pm EST) through April 29th, a brand new, Origin Forme of Giratina will appear, which will become the #1 Ghost attacker in the game, edging out Shadow Ball Mewtwo.
Best Moveset to Have:
Shadow Claw/Shadow Ball
Hardest Moveset to Defeat:
The hardest Origin Forme Giratina to defeat will be one with the Shadow Ball charge move.
Best Counters:
Darkrai: Feint Attack/Dark Pulse
Tyranitar: Bite/Crunch
Rayquaza: Dragon Tail/Outrage
Palkia: Dragon Tail/Draco Meteor
Dragonite: Dragon Tail/Outrage
Dialga: Dragon Breath/Draco Meteor
Mamoswine: Powder Snow/Avalanche
Origin Forme Giratina: Shadow Claw/Shadow Ball
Mewtwo: Psycho Cut/Shadow Ball
Perfect IV:
100% Origin Forme: 2105CP
100% Weather Boosted Origin Forme: 2631CP
Giratina is Weather Boosted in Windy and Foggy weather.
# of Trainers Needed:
To duo Origin Forme Giratina, both players will need to have strong, Level 40 accounts, Best Friend status, and a team of maxed out (Level 35 or above) Rayquaza.
If your group consists of strong, Level 35 or higher players who have the right counters, then 3-4 Trainers should work.
If your group consists of Level 25 or above players, with the right counters (at a minimum 2500 Stardust), 5-6 Trainers will be required.
NOTE: Not only will Origin Forme Giratina be a nice addition to your team of fighters for raids, it’ll be one of the most useful monsters in PVP battles as well.
Source: Niantic