Well, I usually don't accept ubers but... I guess it's fine since you don't EV your Pokémon, using a Garchomp wouldn't be a disvantage for me (with me saying this I just hope it doesn't sweep my entire team xD) P.S.: I won 4-0 against your brother^^
I'm in the same Time Zone as you: I live in Portugal. But at that time I'm at school. I'll only get home at 7. And I said the trophy garden was the best place to train because you mentioned speed and there is where you can find more Pokémon that give speed ev's. Just for that.