What moves raise a stat drastically?

Question

I have seen a few moves that raise stats drastically. What are they?

Answer 1

Regular Moves:
Cotton Guard raises Defense.
Tail Glow raises Sp. Attack.
Fell Stinger raises Attack if it KO's the opposing Pokemon.
Z-Moves:
Z-Splash raises Attack.
Source: https://bulbapedia.bulbagarden.net/wiki/Statistic#Stat_modifiers

Comments

Thank you!

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does belly drum do?

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belly drum maxes your attack stat. (6 stages or x4 attack)