What are the stat differences between Pikachu and Piplup?

Pikachu stats: HP 35, ATK 55, DEF 40, SP.ATK 50, SP.DEF 50, SPD 90. Piplup stats: HP 53, ATK 51, DEF 53, SP.ATK 61, SP.DEF 56, SPD 40.

Which Pokemon is faster: Pikachu or Piplup?

Pikachu is faster with 90 speed compared to Piplup's 40.

WINNER

Total: 320

Total: 314

Pikachu: 2 wins | Piplup: 4 wins

35 HP +18 53

55 +4 Attack 51

40 Defense +13 53

50 Sp. Attack +11 61

50 Sp. Defense +6 56

90 +50 Speed 40

320 +6 Total 314

Pikachu has a total stat advantage of 6 points over Piplup. Pikachu wins in 2 stat categories while Piplup wins in 4.

Pikachu is faster with 90 speed (50 points faster than Piplup). This means Pikachu will likely attack first in battle.