Victini is UU purely because of its typing. The Psychic/Fire typing is extremely susceptible to entry hazards (Stealth Rock, looking at you), and extremely weak to the threat of Pursuit and Sucker Punch - its secondary Fire typing does not help its case in checking the main users of these two moves at all. The two types barely complement each other; the only case is Fire offsetting the Psychic type's weakness to Bug, primarily in the abundance of U-Turns in the current metagame.

Breloom outspeeds Pidgey easily, Spores it, and knocks it out with a Focus Punch seeing as the Normal secondary typing offsets the resistance from Flying. Actually, Breloom can simply Mach Punch with a Technician boost and OHKO it.