These include: Vaporeon, Jolteon, Flareon, Espeon, Umbreon, Leafeon, and Glaceon. That's a lot of options. I'd like to imagine a future where the number of Eevee grow exponentially, one for every possible element type combination. A future where new element types are invented just to have more Eevees. Advertisement.
http://kotaku.com/5984297/there-is-a-new-eevee-evolution-in-pokemon-how-many-of-these-do-we-need
An EV spread of 252 HP / 252 Attack CAN be done because both stats are under 255, and both numbers add up to a sum lower than 510 (in this case, 504). An EV set of 100 HP / 252 Defense / 252 Speed for a Pokemon CANNOT be done because 252 + 252 + 100 is 604. The MAXIMUM sum of EVs for any one Pokemon cannot be over 510.
http://pokerealm.com/articles/ev-guide.php
There aren't that many entirely new Pokemon in this generation...some people are upset about this. Not counting mega evolutions (which I don't believe appear in the Pokedex as normal), the count is believed to be up to 718 as of this writing.
https://gaming.stackexchange.com/questions/134107/how-many-pokemon-are-there-as-of-x-y
An EV spread of 510 Attack CANNOT be done for a Pokemon because the maximum EV count for any one stat is 255. An EV set of 367 HP / 112 Defense for a Pokemon CANNOT be done because the maximum EV count for any one stat is 255.
http://pokerealm.com/articles/ev-guide.php
There are 720 confirmed Pokemon (not including forms) that appear in the Kalos national dex. However hackers have found 1 more, Volcanion, although it has officially been revealed yet. That makes the total Kalos count (as far as we know) to be 721. This means in total the number of new Pokemon in Kalos is 71.
https://gaming.stackexchange.com/questions/134107/how-many-pokemon-are-there-as-of-x-y
How many Pokemon are there as of X/Y? Before Pokemon X and Pokemon Y there were 649 Pokemon in the National Pokedex, not including variant forms. How many new Pokedex entries does Pokemon X/Y add and what are the total number of Pokemon now?
https://gaming.stackexchange.com/questions/134107/how-many-pokemon-are-there-as-of-x-y
On the Pokemon Go app alone, three of the 151 Pokémon you need to catch are three different Eevee evolutions: The Vaporeon, Jolteon, and Flareon. But that doesn't even cover the number of Eeveelutions that exist in the overall world of Pokémon. In total, Eevee has eight different evolutions. And, with Pokemon Go updates on their way, perhaps these Eeveelutions could be on their way. First off, the three main Eevee transformations — which are featured in Pokemon Go — each come with their own unique abilities.
https://www.bustle.com/articles/174905-how-many-eevee-evolutions-are-there-pokemon-go-is-the-tip-of-the-iceberg
But, though the levels and Exp. Points gained are different, the Pokemon that battled either Zubat would still get 1 Speed EV. EVs come from battling any Pokemon and are gained by any Pokemon that gets Experience Points in a battle. Different Pokemon have different numbers of EVs for different stats. Like that Zubat which had 1 Speed EV or say, an Empoleon which gives 3 Special Attack EVs. EV training is simply battling the right Pokemon that gives the right EVs. So now, onto the numbers side of things:
https://www.gamefaqs.com/boards/925601-pokemon-diamond-version/38648412
The fact that it takes evolution 100,000 or 10 million years to make relatively minor changes in existing structures shows just how slow evolution really is. The creation of a new species is time consuming. On the other hand, we know that evolution can move extremely quickly to create a new species.
http://science.howstuffworks.com/life/evolution/evolution10.htm
Evolution has created thousands of different species that range in size and shape from a small brown bat that weighs a few grams to a blue whale that is nearly 100 feet (30.5 m) long. In 65 million years, there are only 650 periods of 100,000 years -- that's 650 ticks of the evolutionary clock.
http://science.howstuffworks.com/life/evolution/evolution10.htm
how many evolutions does ev have?
EV has three evolutions. An ev has three evolutions.