Originally Posted by Fat Screw-On Head
Starmie only has 100 special attack stat and can be a very effective sweeper. Manaphy has 100 sweeping stats and was considered too powerful for standard. Celebi has 100 stats and could run effective offensive and/or defensive sets despite having a whopping 7 weaknesses and one of those a 4x weakness to U-turn. Jirachi Can also run effective Sweeping or tanky sets with base 100 stats. Venusaur only has 82/100/80 offensive stats and was one of the top UU sweepers and even saw a little OU play; it also only has 80/83/100 defenses and is considered to have decent bulk. Kindra has only 95/95/85 offensive stats and could be one of the most scary sweepers in the metagame. Just a few examples.
Also, what is with people saying things that are bulkier than Swampert "aren't very bulky" this generation. Considering 75/75/75 defenses are "average" to "acceptable" 100/100/100 is very bulky. I remember when D/P came out everyone said Heatran would be trash because 4x Ground weakness and Fighting weakness and Water weakness. Just silly.
True, but the problem here is typing. Swampert/Kingdra/Heatran have very strong defensive typing, which lets them get away with lower defensive stats. Celebi (the closest comparison IMO) has similar typing issues but gets off clean because it has key resistances to fighting, ground, water, and electric, which allows for some key synergies. As of yet I have not seen those same synergies with Victini. The weakness to ground is particularly key, as earthquake is one of the most common and powerful attacks in OU play. To make things worse, Victini is ALSO weak to rock attacks, meaning it can get hit by either side of the edge-quake combo (which means bringing in a counter poke to live the hit is extremely hard).
On the other hand, Victini's typing is massively superior to Celebi's or Jirachi's on the offensive side of things. Fire is a great attacking type, and with grass, electric, and fighting attacks to back up powerful stab moves it can achieve impressive type coverage. To make things even better, it can go mixed (something that the other 2 pixies dont do very well) with physical fighting or fire attacks. It just such a shame he doesn't appear to get trick.