Time capsule will be available to use, when you first time visit Ecurteak(spelling?) City.
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There is nowhere the player can capture a wild Bulbasaur in Pokemon Crystal. It can be traded using the Time Capsule.
use the time capsule upstairs in the Pokemon center
Time capsule... Pokemon / moves from Gold / Silver / Crystal and newer do not transfer back though. So the answer is yes. It is a long time before the capsule is available though just as a fair warning. You can transfer all Pokemon TO G/S/C and newer, and if it existed then you can trade it back (Pokemon like Ghastly and Rattata)
Moltres can't be found in Crystal. If you want it in Crystal, you'll have to use the Time Capsule or you could get it from an event in the past. You can find Moltres at Victory Road in Red/Blue/Yellow.
Yes, there is a time capsule on one island