What I thought of so far, I went with the name first and then the character if I couldn't find one to match the name, feel free to add your input and let me know what you think:
Biohazard - Toxicroak (The Hunters in Resident Evil are also Frogs)
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HoneyBee - Beedrill
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SonicFox5000 - Vulpix (You're not Lucario)
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FOREVER KING - Nidoking
Forever King Jr. - Nidoran (male)
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gross - Garbodor
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FOREVER EL1TE - Aerodactyl (Used by the a member of the Elite Four and it has wings)
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AL Eevee - Eevee
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deg222 - Bidoof
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Captain Oxygen - Vanillite (Give that twelve year old an ice cream cone)
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AK XEN0M0RPH - Ditto
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AK Pig Of The Hut - Grumpig
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EMPR_MURK - Murkrow
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DarthArma - Noibat
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KDZ - Absol (The Disaster Pokemon)
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GGA 16 Bit - Meowth
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GGA Max - Machamp
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GGA pimpimjim - Staraptor
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Kyu - Machoke
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Grr - Mightyena
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Indecisive - Tyrogue (Eevee is already taken)
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RDK|Tyrant - Tyrantrum
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Tm_whiteboi - Dewgong
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usbigboy - Snorlax
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EMPEROR_THEO - Magikarp (Theo's playstyle)
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EMPEROR_JUPITER - Deoxys
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EMPEROR_OF_OUTWORLD - Arceus
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Perfect Legend - Mewtwo
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astronout - Palkia
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Noobe - Rhydon
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Kitana Prime - Squirtle (Blue and First)
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n-megabytes - Magnemite
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Pan1cMode - Yamask
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Decay II - Marowak
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Relaxedstate - Drowzee
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Awkward Sloth - Slakoth
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AK L0rdoftheFLY - Venomoth
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Blind_Ducky - Psyduck
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Cossner - Ludicolo
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KingHippo - Hippopotas
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Icy Black Deep - Glaceon
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Ra Helios - Solrock
Dragongod - Dragonair
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MITDJT - Minun
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DJT/MIT - Plusle
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rev0lver - Blastoise (Don't look up Bang Bang, for the love of god)
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A F0xy Grampa - Mega Alakazam
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AK SaltFace - Primeape (probably the angriest Pokemon)
AK Iron Sword - Honedge
AK Glass Sword - Doublade
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AK RM Dream Sword - Aegislash
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R.E.O. - Lickitung
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WoundCowboy - Sneasel
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Tom Brady - Patrat
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Doombawkz