That's true but the writers have made up for some of it with cyndaquil and phanphy evolvinq, noctowl and her across learning new moves etc. only tododile from his johto team is seriously lacking in terms of training
Corpish had good development in ag, kingler should have been the one who got to travel with ash during the battle frontier saga, great opportunity wasted
Huge thanks to Blue Dragon for my EPIC avatar & sig
In terms of underdeveloped - I think Snorlax. It's always been fairly powerful, so never got 'development' as such, it's moves seem to change each time it appears but I can't remember Ash actually training it and certainly not very often if he has.
Muk is developed quite well personality wise, there's a lot of his Pokemon (especially BW ones) that are far less unique. Sure it never actually gets used, so certainly one of the most neglected, and Ash also never trains it - but at least it's memorable unlike some of his other Pokemon.
Kingler probably takes it overall though, combines almost never being used with never being trained and no uniqueness. Plus, Corphish exists - which takes away any uniqueness it might have had.
- Satoshi/Ash Ketchum: 801 episodes
- Team Rocket: 736 episodes
- Takeshi/Brock: 633 episodes
- Kasumi/Misty: 282 episodes
- Hikari/Dawn: 201 episodes
- Haruka/May: 197 episodes
- Masato/Max: 192 episodes
- Iris: 141 episodes
- Dent/Cilan: 138 episodes
- Kenji/Tracey: 44 episodes
Also the top of this thread says "party, Oak's lab, and in training" and the official statement on Primeape is "In Training" so he would fit this category. So I would have to say Primeape
Unfezant. Only joking, I'll stop my birdwhoring a bit now that she's been getting some well-deserved action these last weeks. But yes, Gantoru hasn't been seen in months and Gamagaru hasn't gotten much of a spotlight since that Don tournament which name I forgot, or even the Driftveil Gym battle! However...I don't even know what the hell Muk has done, or 27 of his Kentauros for that matter.
Ranma ½ and Maison Ikkoku fan. And I never got into shipping flamewars about them.