What are the stat differences between Blastoise and Nihilego?

Blastoise stats: HP 79, ATK 83, DEF 100, SP.ATK 85, SP.DEF 105, SPD 78. Nihilego stats: HP 109, ATK 53, DEF 47, SP.ATK 127, SP.DEF 131, SPD 103.

Which Pokemon is faster: Blastoise or Nihilego?

Nihilego is faster with 103 speed compared to Blastoise's 78.

Total: 530

WINNER

Total: 570

Blastoise: 2 wins | Nihilego: 4 wins

79 HP +30 109

83 +30 Attack 53

100 +53 Defense 47

85 Sp. Attack +42 127

105 Sp. Defense +26 131

78 Speed +25 103

530 Total +40 570

Nihilego has a total stat advantage of 40 points over Blastoise. Nihilego wins in 4 stat categories while Blastoise wins in 2.

Nihilego is faster with 103 speed (25 points faster than Blastoise). This means Nihilego will likely attack first in battle.