What are the stat differences between Pikachu and Nihilego?

Pikachu stats: HP 35, ATK 55, DEF 40, SP.ATK 50, SP.DEF 50, SPD 90. Nihilego stats: HP 109, ATK 53, DEF 47, SP.ATK 127, SP.DEF 131, SPD 103.

Which Pokemon is faster: Pikachu or Nihilego?

Nihilego is faster with 103 speed compared to Pikachu's 90.

Total: 320

WINNER

Total: 570

Pikachu: 1 wins | Nihilego: 5 wins

35 HP +74 109

55 +2 Attack 53

40 Defense +7 47

50 Sp. Attack +77 127

50 Sp. Defense +81 131

90 Speed +13 103

320 Total +250 570

Nihilego has a total stat advantage of 250 points over Pikachu. Nihilego wins in 5 stat categories while Pikachu wins in 1.

Nihilego is faster with 103 speed (13 points faster than Pikachu). This means Nihilego will likely attack first in battle.