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 ?
Because that link does not say what he learns in the Dream World. Only:
Try this Link:
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_(Pokémon) and http://pokemondb.net/pokedex/sunflora