After an hour, i got kicked while i wasnt in front of my PC and didnt have the chance to choose which pokemon i want to bring to my game. Did i lose the chance to get the one i want or i need to wait till tomorrow and miss my chance to get him ?
Pokémon wait at the Tree of Dreams as long as you don't take any back with you. You could use the Wake Up button on your profile page, do the entire tucking process again, and even go through an entire 10-12 rounds of Dream World areas full of Pokémon and items before it dries up again, and the Pokémon from the previous session will still be there.
The Island of Dreams areas will only remain dry if you leave the Pokémon tucked in the whole time; also, the limit of 20 waterings of other players' gardens applies per tuck-in, not per day, meaning you'll have to wake up and tuck back in if you want to have more water for other players' gardens...
I am a die hard Pokemon fan to the most, including the traditional hate of Yu-Gi-Oh.