Magnemite right before Homika's Gym. She's more screwed than Yellow Giovanni's Dugtrio when a Level 2 Pidgey switches in.
I knew Riolu would be an early Pokemon due it's Pokedex numbering being Woobat's in BW1 but by this game's Route 2 is pretty crazy. Even Huge Power Azurill seems a bit much this early on. Although they all evolve via Happiness; that could get annoying if Soothe Bell isn't around. I guess that must be how they're keeping early Lucario, Marill, Magmar, & Electibuzz at bay.
Also where's Riolu's cousin Zorua? Seems odd for them to be apart if Riolu's there this early.
Take chances, make mistakes, get messy!