Plant them in the soil where you picked them and water them. If they dont grow then maybe your internal battery has run dry (this means clock based events like shoal cave tide and plants wont grow)
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Mulch
You make its beauty increase examples make it win beauty contests Give it berries that increase beauty
get some berries that levels up beauty then after you kept giving it to feebas then it will evolve but to make it evolve after giving alot of beauty berries you can either use rare candies or fight wild Pokemon with feebas. ------------------------------------------------------------------- LOL Beauty Berries. Here:http://bulbapedia.bulbagarden.net/wiki/Feebas_(Pokemon) tobyunkown ------------------------------------------------------------------------
Dingle Berries
Pokeblock's are not in diamond instead there called poffin's, just like ruby, sapphire and emerald in the Pokemon contests you can create your own poffin using berries.