"Fixed" pokemon

Use Ctrl+F to look for a specific pokemon to see if it has been "fixed" already:

Samurott: -retcon into water/fighting
-give access to all swords/slash moves
-give access to shell smash

Banette: -retcon the mega as a regular evo and as ghost/fighting
-provide actually powefull ghost physical moves

Carnivine: -grass/dark or fire mega
-HA strong jaw for crunch
-Signature move against flying and bug types called "fly trap"

Rampardos: -mega with increased speed and/or speed increasing ability

Lapras: -retcon into dragon/water type
or
-mega/evo with dragon/water typing and stat rebalanccing for specialization.

Flareon: -movepool overhaul (new offensive and utility moves)
-stat redistribution
-Introduce a Conflagrate/Burninate ability, an -ate ability for fire types
-Possibly provide an ability like fluffy to make it a niche and not OP
-Give it a baseball hat* (may not be the best alternative)

Audino: -Increase the tail fluff by 80%
-Change healer for triage or unaware, or buff healer to heal the user 30% of the time too
-minmax the mega (-40 attack and +40 special attack)
-rework its moves (give it parting shot and buff heal pulse)

Vespiqueen: -Retcon to either Bug/Psychic or Bug/Fairy
-Order moves increase in power with stat buffs
-expand movepool and buff order moves (attack = 120BP, Defense = +2, Heal = cure status)

Luxray: -Retcon to Electric/Dark
-Improve speed via minmaxing or minor buffs (103 speed preferably)
-New ability X-ray vision (tinted lens or compound eyes)

Zangoose: -Increase the movepool (including extreme speed)
-Rework toxic boost to nullify poison damage
-Give it fur coat as its second ability

Cacturne: -Increase its speed to allow it to run sub-punch sets
-increase bulk to make it a better sweeper (both of these with a mega)
-Give it adaptability or keep water absorb in the mega
-minmax it, reduce special attack and add it to other stats.

Seviper: -minmax it: reduce one offense for speed, or delete speed and offense for bulk
-alternatively, buff its attack stats so assault vest will be the only defense required
-New ability: Protean?
-Alolan form

Virizion: -movepool increase to allow for special sets and support sets
-Change the highest stat from Special defense to speed
-Thicker hindlegs (?)

Delcatty: -Give it an evo
-Rework normalize to work as "-ate" abilities, or give it utility abilities like fur coat/regenerator
-Alternatively, rework normalize as a field effect, neutralizing type advantages and disadvantages, and inmunities to attacks and statuses.
-Retcon a second typing, fairy would be the most appropiate and usefull choice
-Alolan form

Archeops: -Change its ability to a mediocre but fitting one (Ex: Early Bird, Reckless)
-Change its ability to a better one to use its movepool effectively (Ex: Rock Head, Gale Wings)
-Change its ability to one that gives it variability (Ex: Uburden, Klutz)
-Nerf Defeatist to make the drop off of stats more gradual, only hitting half at 1% HP, make it activate at 1/4 HP instead of 1/2, make it drop attack and speed by 1 stage instead of 50%, etc.
The only thing to change is the ability, that's the point I'm trying to make.
-Alternatively, increase speed to 120 and attack to 165 to make it be worth the ability

Cofagrigus: -A more reliable form of recovery (Recover)
-More assist options like toxic spikes or stealth rocks

Bellossom: -Retcon it with Fairy as a secondary type
-Movepool increase, things like quiver dance and fiery dance
-Give it dancer as its Hidden ability
-Rebalance some points from attack to special attack
-Alola form: fire/grass with the changes mentioned before
Or, a more complete response:
- to quote an anon: " It would need some serious boosts to stand out - at the very least Dancer, Fairy-type, Quiver Dance, and a great deal more speed; with all those, it may as well be a mega.

However, that's it if it's a solo operator. If it were built for doubles, maybe it'd have a chance. Dancer could copy buffs, and if you gave it 10 more Atk, it could use Dragon Dance and Swords Dance just as well as Quiver Dance. All it would need is a few more tutor moves - Knock Off and Play Rough would do it, and it already gets Drain Punch by tutor - and it's got a good physical set. Admittedly, to be viable at all, it'd need at least 20 more Spe to get a reasonable buff from any speed-boosting Dance"

Furfrou: -Increase defense to work better with fur coat
-Movepool expansion (Milk drink)
-Buff fur coat to ignore contact effects, such as rocky helmet, static and rough skin
-Rework the haircuts: they now add up to 50 BST and add a secondary typing upon use, depending on the haircut