Question

So in the pokemon dream world I meet a sunkern with Earth Power (!) and I get it .I am surprised . Αlso i check the link above and I saw that sunkern don't learn earth power . How can this happen ?

Answer 1

Because that link does not say what he learns in the Dream World. Only:
-Level Up
-Breeding
-Tutor

Try this Link:
http://bulbapedia.bulbagarden.net/wiki/Sunkern#Dream_World-only_moves

Answer 2

Some Pokemon come with moves in the DW that usually they only learn by Gen IV move tutor, breeding, or moves they can not learn any other way. Such as in the case of Sunkern. Though it is worth noting that Sunflora(Sunkern evolutionary form) can learn Earthpower by HG/SS move tutor. Sources: http://bulbapedia.bulbagarden.net/wiki/Sunkern_%28Pok%C3%A9mon%29 and http://pokemondb.net/pokedex/sunflora

Comments

The guy up hasn't a lot of points thats why i give the best answer to him.

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Points do not matter. Though you should know that you are supposed to give Best Answer without regard to who answered but the answer itself.