What do you excactly mean?
There are 10 teens on a V3:
Young Mametchi
Young Mimitchi
Oniontchi
Hinotamatchi
Hinatchi
Nikatchi
Obotchi
Hikotchi
Patapatatchi
Hashitamatchi
Some of them seem to come when you treat your Tama badly and some when you treat it goodly but I can't really say what's the best teenager. And some of them can be got only on odd generations and some only on even generations. But usually people consider Young Mametchi and Young Mimitchi as the best teens.