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There are enough people with sick grades/test scores, college want to go for more.
And they also don't want people cooped up studying in their dorms all day long. College isn't just for education, it is developing connections with other people and being in an active, exciting environment.
Entei with Flare Blitz has a some significance. He FINALLY gets a good STAB to take advantage of his rather nice Atk stat. Obvious a CB or a LO, together with SR, will make sure he dies fairly quick, but he can probably do some serious damage.
The other two obviously don't have as much...
I don't even know what you are trying to say here.
Overall, I just don't get the point of your post. Your final statement that tiers cause problems is ignorable; any system will have problems. Are you trying to care about originality? Who cares about originality if you can't win. You aren't...
Salamence's biggest thorn in his side is his survivability; taking 25% on each switch in, usually losing 10% for each attack, and losing 6% to ever so common sand is really just so much, especially because priority is omnipresent to smack him around. If anything, switching in is Salamence's...
The big question is really...why care? The metagame has always been heavily centralized, and metagames will always be centralized.
This is competitive pokemon. People want to win. People use the best pokemon since it helps them win.
I definitely feel that having both Chansey and Blissey is definitely not a very good idea. If you play Blissey correctly, you shouldn't have to have both.
I feel the main issue you will have is the inability to stand up to real, hard hitting heavy offense with those two. With heavy offense...