It just runs around Wispy Ruins, so it's not too hard to track down. It takes a while though, you have to find it about 5-10 times. Eventually it returns to the place behind the waterfall where you first find it.
EDIT: And thanks for the suggestion NikeSB, I was thinking it might be worth trying Swampert out when more content is released. The Ground typing would help my team a lot.
Main squad:
Toxicroak (56), Cofagrigus (57), Greninja (57), Tangrowth (57), Pyroar (57), Meowstic (58)
Bench:
Hitmontop (55)
I'm considering replacing the Greninja, it's definitely the weak link in my team.
Yep, that bridge cannot be crossed. I'm not sure what the deal with that is, but it doesn't prevent you from completing the Gurdurr quest (or any others).
I agree with ShingSt, I doubt they'll be in the game for a long time. Maybe even only postgame. If they're introduced prior to postgame, we'll only be able to get the worst ones. Megas are way too overpowered, both for Reborn and Rejuvenation.
If it doesn't have a star when caught, it could still become shiny when purified, I think. Honestly, this isn't very well-documented though. It would be a good opportunity to experiment with it, since Rejuvenation has a high shiny chance.
I know this is Rejuvenation, but in Zeta/Omicron shininess is determined both when you catch it AND after purification. In other words, there's a chance for it to have a star when you catch it, but when you purify it the shininess is recalculated, so it could lose that star. And vice versa. It might work similarly here.
If the file is still in the trash can, you can restore it. And yep, you can put your own songs in by putting them into the music folder and giving them the right name. But make sure the file is the right format.
He would have if he'd caught more Pokemon, instead of essentially soloing it with Woobat. Or at least if he had bought another Reverse Candy so his Monferno actually obeyed him...
Ah yeah, I used a Light Screen Prankster Meowstic so my Tangrowth could tank those. Prankster Meowstic is very useful in general, I recommend it. You can get Espurr from the Casino, and Light Clay from mining. Otherwise just get a Quagsire like ShingSt said.
The key to Valerie is to stall out the Politoed's rain. You could try having Ampharos use Thunder Wave and Confuse Ray, then spam Super Potions. Just don't let it faint. After that Ampharos and Tangrowth should make short work of her. Just remember to use Thunderpunch on the Milotic as it is a specially defensive Pokemon, and save the Hariyama for her Lapras.
I think I did it by heading left so the people running after you get trapped below the pool of water, trying to run upwards. Then you just need to be careful not to move into the field of vision of any of the stationary NPCs.
One of the children selling stuff in the Lost Camp (after upgrading twice) crashes the game:
EDIT: Also this Matthew guy in the Lost Camp (after the second upgrade) has somehow managed to clone himself: