1. Anything involving future storyline is pretty much a big question mark as no one can predict what the writers will think of. I'm afraid that most of the time it is pretty much Ash and co. travelling around, helping people out, blasting off Team Rocket. However there are specials, Gym Battle arcs, the Sinnoh Battle Frontier, and the Sinnoh League to look forward too. And don't forget, Team Galactic is still at large and so there will no doubt be an arc involving Ash and co. helping thwart Team Galactic's plan.
As for Ash's rivals just there to provoke Ash, Paul has pretty much decided Ash is a fool and he'll be no challenge if he verses him at any point in the future, so that only means that they will no doubt battle in the Sinnoh League.

2. Domino can be looked as being a "character-of-the-day", most characters that appear in movies or specials never really appear again sadly.

1. Right now, there are 35 Pokemon considered to be Legendary. Lucario and Rotom, despite popular belief, are NOT Legendary Pokemon. On that same note, despite popular belief, Phione is indeed a Legendary so it is counted (Making the total 35 like I said before).

2. No, the first Generation I Pokemon that isn't Pikachu nor Meowth to be seen in the Sinnoh saga by the viewers goes to Magicarp, seen in very beginning of the intro of DP001 "Following a Maiden's Voyage!".

yeah that sucks but do u still think that my idea would spice up the series i have seen the pokemon series decline since the first couple of seasons becuase it stopped being interesting. I think it would be great for Domino to come back getting my character to have some head to head battles with the strong trainers or leader like cynthia, paul, Team Galactic leaders, and pokemon hunter j and win. Domino and my character could team up being sent on a mission in the Sinnoh region to stop team Galactic from conquering the world and set up team rocket in the region, because jessie and james have gotten old. They could lead squads it would be like a mission like idk socom so something like that and Domino would tell more about herself and her history since we dont know much about her same with the new character while they open up their secrets Domino would trust enough to start liking him adding a little love team since the pokemon series doesnt have much of that.

i think thats a storyline that i think would interest more people wat do u guys think of that storyline?

Future storyline so we don't really know. If I had to make a guess, Dawn will be in Ash's current travelling group until Ash heads to the next region. Dawn will most likely meet Delia during the Sinnoh League as she and Professor Oak usually travel to the Pokemon League Ash is participating in, usually during the ending rounds. Dawn will most likely stay with Ash's group through the Sinnoh Battle Frontier, but we don't know when that might be.

However, for all we know, the writers might surprise us and next region replace Brock with the new male character (unlikely, but still a possibilty). Overall, we'll have to wait till the next Generation and region to be sure.

Yes, Lucas does make a cameo appearance in the beginning of the 11th movie, Giratina and the Sky Warrior. He's in a middle of a battle with another playable character that never truely got a role in the anime, Brendan the playable boy character in Ruby/Sapphire/Emerald (a.k.a. May's male counterpart).

Overall Crobat is better as its stats are better spread out, but if you need a Ghost-type then Drifblim would be the one you may want to gun for. Drifblim also has 3 immunities: Normal, Fighting, and Ground; the last one probably being the most useful of its immunities.

As for what attack Heracross should learn betweem Rock Slide and Earthquake, go with Earthquake hands down.