Trying to fix bad Starters!
Starters in definition are "
the Pokémon the trainer chooses at the beginning of their Pokémon Journey and the main protagonists of the Pokémon Series of games".
Now being the Main Protagonists of the Game they're in makes you think that they are very strong, but even though some of them are incredibly strong to the point of Uber Level some of them are weaker than your average 3-Stage 400-500 BST Pokémon, So why do they suck well-.
The Problem
Now the reason for this is because of how a Pokémon Functions or their specific "Niche" some Pokémon have a niche they can fulfill, for example Wall Breakers, Defensive Pivot, Sweeper, Suicide Lead, Defogger, etc., having a role or multiple roles help develop a Pokémons Viability and justify using them on your team, but seeing this title will probably spoil the fact that Most Starters do not have a Niche in the OU tier and end up on lower tiers where they can actually find a purpose, which is kinda sad and depressing when you find out that your favorite Starter which the one you go on with your journey with is in NU, so I will try to fix them.
Fixing Process
Now when i fix a Starter I will mostly be aiming for it to be on the OU tier which is the the highest tier that regular Pokémon can be played at without stumbling at Box Art Legendaries.
My method of fixing these Pokémon will be by finding them a Niche that they can fulfill successfully this done by giving them new moves, abilities and shuffling there Base Stats, so without further ado let's get fixing shall we.
Meganium (PU)

HP: 80
Atk: 82
Def: 100
SpA: 83
SpD: 100
Spe: 80
BST: 525
Abilities: Leaf Guard, Overgrow
Meganium has only one role which is being a cleric (a role it already has high competition with Audino) by having Aromatherapy and the other notable moves it has is Dragon Tail, Giga Drain, Synthesis, Petal Blizzard, Leech Seed, Swords Dance, and Seed Bomb, this Pokémons moveset is just pathetic the first thing I'll add is Calm Mind as boosting move that pairs well with Giga Drain, the second thing I'll add is giving more coverage so things like Focus Blast, Power Gem, Ice Beam and Weather Ball which will pair great with it's new ability Chlorophyll now when I give abilities to Starters I want to give them ones the fit in thematically and this ability is very common for Grass Types why not give it that, but the problem with giving this ability to it is that it will face competition with Venusaur which is why I gave it a new move to give it a different niche than a Sun Sweeper and that is Solar Drain a 80 BP move that heals the user for 75% of tha damage they dealt this move will help it establish a Niche as a Bulky Sustainer paired with Leech Seed, and Calm Mind to not only heal more but also tank more special hits, now for the Base Stat changes I decided to buff it by 10 points to be the same BST as Typhlosion then added more points in HP, Def, SpDef and SpAtk to help it at its Niche More.
After Results
New Meganium

HP: 100
Atk: 75
Def: 100
SpA: 105
SpD: 100
Spe: 55
BST: 535
Ability: Chlorophyll
New Moves: Calm Mind, Solar Drain, Power Gem, Focus Blast, Ice Beam, Weather Ball
So is it capable of having a Niche in OU? Do you have anything you want to add? I'll be happy to read your replies and hopefully make my skills at fixing Pokémon better since I do plan on making more of these.