Tiered in terms of fun, creativity, competition and community relevance.

TIER 1				REASONS TO RUN					REASONS NOT TO RUN
Bulbasaur% (FRR2)		Very creative, completes starter trio		Long, hard to execute, need high stats
Weekly routing challenge*	Competitive, collaborative, creative		Requires organization and promotion

*Pick an alt main Pokemon to route (voted for by community), then everyone in the community has 1 week to route it and complete a run of it. Can complete the run at any time during that week, and best time wins (grinding for a run with great luck would be allowed but discouraged)

TIER 2
Bulbasaur% (FRLG)		Creative, completes starter trio		Slow, route is mostly optimized
Egg% (Crystal)			Very creative, challenging, shiny routes!	Elekid/Magby done in CC, some pokes unrun
Togepi% (Crystal)		Creative, new happiness strat, challenging	Overuse of Return
Rocky% (Crystal)		Creative, challenging, compete with Werster	None?
Dots% (Emerald)			Creative, challenging (obey), fixed stats	Ralts and Abra manip
Emerald Baton Pass (manipless)	Use a variety of pokes, challenging		Early game is all Marshtomp
Crystal Baton Pass (manipless)	Use even more pokes (Kanto), challenging	None?

TIER 3
Geodude% (Crystal)		Challenging, compare to TAS strats		Possibly very luck-heavy, many easy fights
Espeon% (Crystal)		Happiness strats, my favorite poke <3		Time to evolve, special sweepers are boring
Squirtle% manipless (Blue)	Competitive, old-school, starter trio		Need encounter luck and tough red bar
Charmander% manipless (Red)	Semi-competitive, starter trio			Did it before with manip
Bulbasaur% manipless (Red)	Creative late-game, starter trio		Horrible until Body Slam
Ruby All Ribbons		Creative, challenging, a real accomplishment	Very long, bad manips, manip ambiguity
Makuhita% (Sapphire)		Creative, unusual moveset, fixed stats		Brawly fight
Snorlax% (FRR2)			Some creativity, Ganja requested it		Lack of challenge, late acquisition
Snorlax% (FRLG)			Some creativity, Ganja requested it		Lack of challenge, late acquisition
Snorlax% (Red)			Some creativity, Ganja requested it		Lack of challenge, late acquisition
Dugtrio% (FRLG)			High early level, TyrantNeptune requested it	Difficulty capturing, lack of challenge
Mankey% (FRLG)			TyrantNeptune requested it			Boring fights

TIER 4
Blastoise (FRR2)		E4R2 fights are fun; competitive route		Mostly the same as Mewtwo route	
Electabuzz (FRR2)		Challenging, new way of running FRR2		Late acquisition, boring fights
Teddiursa% (Crystal)		Competitive, bear is OP in some spots		Teddiursa YOLO ball grind, bad early game
Kenya% (Crystal)		No encounter RNG, compete with Underscore	Overuse of Return
Ruby (any%)			Competitive, partially unrouted late game	Mostly the same as Sapphire
Lapras% (FRR2)			Some creativity, one of my favorite pokes	Late acquisition, boring fights
Lapras% (Crystal)		Creative acquisition, one of my favorites	Late acquisition, boring fights
Colosseum (All Colosseums)	Creative, knowledge-based			Very long, tons of luck
Aerodactyl% (FRLG)		Late L5 forces creativity			Very late acquisition
Torchic% (Sapphire)		Completes starter trio				Abra manip (?), similar to Emerald
Dratini% (Crystal)		E-speed is cool, late L15 forces creativity	Very late acquisition
Johto starter(s)% (XD)		New type of fight routing (animations?)		Very long