10,000,000 Volt Thunderbolt is available to Pikachu with a cap, but how to get the Pokemon and Pikashunium Z is unrevealed.
Fire : Move type
Hippowdon DB: stats, moves, locations & evolution
Ponyta DB: stats, moves, locations & evolution
Sharpedo DB: stats, moves, locations & evolution
Rock : Move type
Lanturn DB: stats, moves, locations & evolution