I will only list the earliest in the line, in all cases, but any in the line is all right as I can breed/train as necessary to clear all entries in the line.
This list is only from Kanto. If you have none of these (I've excluded three legendaries that later appear in SoulSilver), I can move to a Johto list. As I said, I'm not fussy, but I still want to start with ones I don't have, and if by chance none of those are available, I'll still trade what I can. :)
Pidgey, Rattata, Ekans, Oddish, Diglett, Growlithe, Abra, Bellsprout, Tentacool, Magnemite, Grimer, Drowzee, Voltorb, Koffing, Chansey, Mr. Mime, Scyther, and Tauros.
Many of those I have in SoulSilver, so they would save me a breeding/cloning/recatch/transfer of that line. Of the most interest ATM are Growlithe (had to get Fire Red, not in any of my other games and not playing FR yet), Chansey, Grimer, or Mr. Mime (last three not available until Kanto, saves me looking for them to import later when I'm not thinking about importing). Scyther is also welcome even though I have one; if it has a Metal Coat, it gives me Scizor. (If you decide on Scyther with Metal Coat, let me see if I have one yet before we do it so I can return it. If not, I can trade with my W2 later and get it myself. If you need Scizor, I can even trade it back for the others above.)
This list is only from Kanto. If you have none of these (I've excluded three legendaries that later appear in SoulSilver), I can move to a Johto list. As I said, I'm not fussy, but I still want to start with ones I don't have, and if by chance none of those are available, I'll still trade what I can. :)
Pidgey, Rattata, Ekans, Oddish, Diglett, Growlithe, Abra, Bellsprout, Tentacool, Magnemite, Grimer, Drowzee, Voltorb, Koffing, Chansey, Mr. Mime, Scyther, and Tauros.
Many of those I have in SoulSilver, so they would save me a breeding/cloning/recatch/transfer of that line. Of the most interest ATM are Growlithe (had to get Fire Red, not in any of my other games and not playing FR yet), Chansey, Grimer, or Mr. Mime (last three not available until Kanto, saves me looking for them to import later when I'm not thinking about importing). Scyther is also welcome even though I have one; if it has a Metal Coat, it gives me Scizor. (If you decide on Scyther with Metal Coat, let me see if I have one yet before we do it so I can return it. If not, I can trade with my W2 later and get it myself. If you need Scizor, I can even trade it back for the others above.)