Of course, there are Moltres, Zapdos, Articuno and Mewtwo.
You can catch rayquaza
No, Celebi or any other Legendary Pokemon can't have an egg.
Yes, there is one which is not able to train properly, suicune
with a master ball or weaken it and throw ultra balls until u capture it
Yea there is the island with the 7th gym on it is an island.
Only Generation 1 Pokemon may be traded between Yellow & Silver. Note: The player using Silver version must only have Generation 1 Pokemon in his/her party and the Pokemon must have learned no moves that did not appear in the Yellow version. Also they mustn't be holding any items that didn't appear in the Yellow version.
You can't find Ho-oh on Pokemon Yellow or any other version that is based in Johto but I think you can get it in a trade.
i cannot answer the question - wich legendary Pokemon evolve? but i can answer the question - do any legendary Pokemon evolve - and the answer is... no!
You can not swim in any of the Pokemon games. You can Surf, however, in EVERY game.
Use it on any legendary that is hard to capture, like a Regi or the version exclusive.
Nothing of any real importance, but there are a few items
If you miss catching any legendary you can't get one unless you have another version trade you the ones you didn't catch Example: Since you missed Moltres then have Blue or Yellow give you a Moltres.