Everyone has had that pokemon that they capture/get and intend to use on a playthrough but it ends up either being banked, requires loads of extra effort to keep up or not really helped out that much.
Mine are
Geodude -> Golem - I love these guys truly but whenever I try to get them in a playthrough team they always struggle. They start off great hammering zubats and pidgeys but those last ice/dragon gyms/dungeons also end up making them 5-10 lvls lower than everything else and they end up getting banked for something else.
Dratini - Dragonite is my favourite but seriously obtaining a low lvl dratini and using it in a playthrough is an effort. It is weak, poor learnt moves, slow to level and takes forever to evolve. Takes alot of effort and by the time Dragonite turns up the elite 4 might even be over.
Gastly to Gengar - I used a Gengar on my recent Diamond/SSilver playthrough and it was hard work. Gastly learns nothing great early on. Lick doesnt work vs all those early mons and curse....just no. This time I managed to get past the early problems but the elite 4 and its Dark/Dragon/Ice/Psychic members just one shots the poor dude. Not really worth it sorry Gengar fans.
Togepi - I think it might be again an early move thing but I always try to get togepi involved but it never lasts past 30. Doesnt help I usually get a Hustle one....doh
Leavanny - Poor thing. I really like it but again that type just gets hurt and killed alot. Used one on and it truelly struggled.
Mine are
Geodude -> Golem - I love these guys truly but whenever I try to get them in a playthrough team they always struggle. They start off great hammering zubats and pidgeys but those last ice/dragon gyms/dungeons also end up making them 5-10 lvls lower than everything else and they end up getting banked for something else.
Dratini - Dragonite is my favourite but seriously obtaining a low lvl dratini and using it in a playthrough is an effort. It is weak, poor learnt moves, slow to level and takes forever to evolve. Takes alot of effort and by the time Dragonite turns up the elite 4 might even be over.
Gastly to Gengar - I used a Gengar on my recent Diamond/SSilver playthrough and it was hard work. Gastly learns nothing great early on. Lick doesnt work vs all those early mons and curse....just no. This time I managed to get past the early problems but the elite 4 and its Dark/Dragon/Ice/Psychic members just one shots the poor dude. Not really worth it sorry Gengar fans.
Togepi - I think it might be again an early move thing but I always try to get togepi involved but it never lasts past 30. Doesnt help I usually get a Hustle one....doh
Leavanny - Poor thing. I really like it but again that type just gets hurt and killed alot. Used one on and it truelly struggled.