Gen IV added 22 evolutions and 7 pre-evolutions. Gen III added 2 pre-evolutions. Gen II added 11 evolutions and 7 pre-evolutions. Gen V added 0 of both.
9 of Gen II's evolutions were added to previously standalone Pokemon. Only wynaut was added to a standalone Pokemon in Gen III. Gen IV added 15.
If the new game adds a similar amount as Johto and Sinnoh, it'll have 100-ish new Pokemon. 56 non-legendary Pokemon do not evolve out of 607. If they add in 105 more Pokemon, and 10 of them are legendary, that means that 9 or 10 of them would be unrelated to any other Pokemon. Or, more accurately, that will be the net gain of non-evolving Pokemon.
At the time the games were released, 19 were standalone in Gen I, 21 in gen II, 18 in gen III, 8 in gen IV, and 13 in gen V.
After later games added evolutions: 6 cannot evolve in Gen I, 12 in gen II, 15 in gen III, 8 in gen IV, and 13 in gen V.
That's an average of 16 non-evolving Pokemon added per game. To maintain the 91% balance of evolution, 6 pokemon who previously could note evolve would need to be given evolutions. The largest category is Gen 3, but most likely they'd give some love to the other generations with one or two from those.
My candidates? Tropius, Absol, Relicanth, Mawile, Sableye, Corsola, Sawk/Throh, Skarmory, and Kecleon.
Originally Posted by Fat RBG
The original Japanese name doesn't imply gender at all.
That may be so, but Jynx and Gardevoir look pretty feminine. Solved somewhat with Gallade, but not entirely.