Hey I want to know where should I train my level 50 Dragonair?

Ok here are some suggestiong
1. If your dragonair does not have the effort ribbon (full EV's) he should likely be trained at lake acuity to get attack EVs and speed EVs. If he has full EVs I would just take him probably to route 227 or something.
2. Lapras is nothing special. Kyogre is good but I would urge you to have a non-legendary water Pokemon for battles in the battle tower. Might I suggest starmie or milotic?
3. He most likely has full EVs so I would try and rock out in stark mountain if he has good moves. If his moves arent compatible with those guys I would look elsewhere on that island.
4. Same deal with charizard
5. No you have normal luck. There is a 1/8192 chance of finding a shiny.
6. Dragonite is better then dragonaire and flygon
7. Yes the swarms are random and can be repetitious. You never seem to get the good ones like swinub or beldum
8. Theres not much in the way of electrics. I would suggest a bunch of non electrics and give them electric moves like thunderbolt. Or get electivire cause he rocks.

You should train dragonair in Pokemon league road thing.
I have a 100 charizard and trained it against the 1st elite 4. Tyranitar with hi lv. Grass Pokemon or physic if it nos crunch.
Bad luck with bidoof. My friend got 1 with 4.
Fly gon and dragonite are better but fly gons moves are not as strong.
Not sure about luxray dut evolve electabuzz to elecktrike if needed.
Kyogre is the winner easily because of sheer cold,hydro pump,and water spout.

It'd be better to us, and to yourself, if you could number your questions.

1. You should train your Dragonair somewhere along the Eastern Island.
2. You should also train your Tyranitar somewhere along the Eastern Island.
3. You can ALSO train your Charizard along the Eastern Island.
4. It's better that you get a longer chain of them; around 40, maybe.
5. That's a good way to think, however just because it's more succestible doesn't mean it's worse. Between Dragonair and Dragonite, Dragonite is better, however there are better Dragon Pokemon out there. And Flygon isn't any better, because he's also succestible to ice attacks. Although, the best attacks for them to learn would be easier for Flygon to learn than for Dragonite.
6. The swarm should change every 24 hours, starting at 00:00 hours, and is random, so it is possible that it will repeat.
7. A good electric Pokemon (that can be caught in-game) would be Electivire.