What is the move that most Pokemon can learn?

Question

I believe it's Protect, not sure though.

Answer 1

Nope it is Hidden power. Source: http://bulbapedia.bulbagarden.net/wiki/Hidden_Power_(move)

Comments

I thought ALL Pokemon were able to learn Protect! :o
(Except of course Ditto)

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Not Regigigas.

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Magikarp XD

Answer 2

Gen 1: tie between toxic, rage, mimic, double team, bide, rest, substitute
Gen 2: hidden power
Gen 3: hidden power
Gen 4: hidden power
Gen 5: hidden power
Gen 6: hidden power
Gen 7: tie between hidden power and protect
Gen 8: protect
Gen 9: tera blast

source
(this answer assumes the most common move is always a TM move. this is very likely but not certainly true)

Comments

What about ALL the moves that most Pokemon can learn, as there's a select group mentioned in the other thread.

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The full list for every generation is in the source.