I think this is the right place to post this, right?

Anyways, I'm pretty far in Yellow, but I'm still having some trouble w/choosing between certain Pokémon of certain types. They're all at least Lvl 40 and I have all but the last gym badge...

First, I'll go through the types that I have definitive Pokémon for...

Normal - Snorlax - Lvl 40 - Body Slam, Beadbutt, Amnesia, Rest

Electric - Pikachu (der) - Lvl 52 - Thunder, Thunderbolt, Slam, Light Screen

Grass(/Poison) - Venusaur - Lvl 40 - Razor Leaf, Tackle, Leech Seed, Poisonpowder

Ice(/Water) - Lapras - Lvl 40 - Ice Beam, Body Slam, Water Gun, Confuse Ray

Ground - Marowak - Lvl 41 - Thrash, Headbutt, Bone Club, Focus Energy

Flying(/Normal) - Pidgeot - Lvl 40 - Wing Attack, Gust, Quick Attack, Sand-Attack

Psychic - Mew - Lvl 52 - Psychic, Mega Punch, Metronome, Softboiled

Ghost(/Poison) - Haunter - Lvl 45 - Dream Eater, Night Shade, Hypnosis, Confuse Ray

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Now for the types I can't decide on...

Fire

Charizard - Lvl 40 - Slash, Ember, Rage, Leer

Ninetales - Lvl 42 - Flamethrower, Quick Attack, Fire Spin, Confuse Ray

Flareon - Lvl 41 - Bite, Quick Attack, Fire Spin, Sand-Attack

Water

Blastoise - Lvl 40 - Skull Bash, Surf, Bite, Bubble

Gyarados - Lvl 41 - Hydro Pump, Bite, Water Gun, Dragon Rage

Kingler - Lvl 42 - Crabhammer, Stomp, Bubble, Leer

Fighting

Primeape - Lvl 40 - Karate Chop, Seismic Toss, Fury Swipes, Focus Energy

Hitmonlee - Lvl 43 - Jump Kick, Rolling Kick, Double Kick, Focus Energy

Poison

Muk - Lvl 40 - Sludge, Pound, Disable, Minimize

Nidoqueen - Lvl 40 - Body Slam, Double Kick, Scratch, Poison Sting - Or maybe Nidoqueen should be in competition with Marowak for my Ground type??

Bug - This one is probably the hardest and will require looking at the overall team in the end since the choices are like polar opposites...

Butterfree - Lvl 40 - Psybeam, Gust, Poisonpowder, Sleep Powder

Pinsir - Lvl 40 - Vicegrip, Seismic Toss, Bind, Focus Energy

Rock

Onix - Lvl 40 - Strength, Rock Slide, Rage, Screech

Kabutops - Lvl 40 - Slash, Scratch, Absorb, Harden

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So, anybody got any ideas maybe for who I should choose? See any weaknesses maybe in those that I have that could be helped with a specific one of those that I can't choose among?

Well, you've got some great Pokes there. It just takes deciding which ones you want to train.

Of that list, pick your favorite for every type (it might be by best moveset, highest level, or just favorite Poke).

Those will be the ones you should train for that type.

As for the ones you have decided, pick out the ones that will do well against certain types. Knowing that Lorelei uses Ice/Water types, a Fire might be good, but the attack itself is only regular effective.

I would suggest the following six types (or any mix of the above, or hybrids).

Psychic
Normal
Fire
Water
Dragon
Flying (with Fly to avoid attacks)

Of course, that's just my perception. It's really up to you, after all I can only offer help.

Hope this helps!

AEPMT