when you see them start ti evelve push the b button and they stop
There isn't another way besides the day care.
Yes there is plenty more online games.
pretty much nothing besides leave it in the daycare with another Pokemon to have them breed
Defeat the Pokemon Masters.
Yes if you breed eevee on four island.
if you use them to much or have them walk with you and when you go to heal you Pokemon the nurse will say" Oh one of your Pokemon has been infected with Pokerus"
This is completely false, Nintendo did NOT program another region in Pokemon Diamond, besides Sinnoh.
The stones given to you as a first place winner are chosen at random. You have to beat the elite 4 then go to kanto and if you win a bug catching contest it will be random.If you come second you'll get a everstone
Well Besides Arceus, Mewtwo Is The Strongest Pokemon. Cool! Thx dude!
Pokemon indigo
trade, catch Pokemon, etc.
You can always use an Action Replay code or trade it for another Pokemon online if you didn't have the chance to catch it.