I REALLY want this dragon because I love all of the Rainbow types! The 7-day time limit really isn't fair, though. Couldn't they at least give us 10 days?

I have a question about the Quest Outpost (I haven't sent any dragons on quests other than the world event ones in a long time). Can I send the required dragons on quests no matter what level they are, or do I have to evolve them first? I had to get rid of my Magic and Island Dragons awhile ago because of limited space, so I had to speed breed for them today. I'm really hoping I don't have to tie up my Evolution Temple for 40 hours!