Let's see here...
Blastoise - That's a Blastoise from Base Set 2. The logo for Base Set 2 is a stylized 2 with a Poke Ball by it (look at the picture's bottom right). It's a holo.
Dragonair - From Base Set. Base Set has no symbol. Not a holo.
Azumarill - That's from the Neo Genesis set, the first of the four Johto sets. Also a holo.
Meganium - From Neo Genesis (the double-star is its logo). Holo.
Dragonite - A holo from Fossil (the logo is Aerodactyl's claw). From the photo it looks like it's in rather poor condition because I can see that little layer of film slowly peeling off.
Mewtwo - From Base Set. Holo.
Alakazam - Wow! A reverse holo Alakazam from Legendary Collection! These are pretty hard to come by; you could probably get quite a bit of money for that. I just checked Troll & Toad, and they give the price as $6
, but they're pretty hard to find so I'd probably value it a bit more than that.
Ivysaur - Another reverse holo from Legendary Collection. Most of the reverse holos from that set are collector's items now.
Hitmonchan - Ah, good old Hitmonchan from Base Set. Holo.
Beedrill - I'm pretty sure the Beedrill is fake, since it gives the original set as Base Set, and that Beedrill wasn't holo in any of its incarnations...unless that happens to be light reflecting off the card itself, which I doubt.
Mr. Mime - Ah, that's from the Jungle set (the logo is Vileplume's flower), and it too is a holo. I think I can see the film on that peeling off too, much like the Dragonite.
In summation, a lot of the cards you have are basically collector's items now, since they're all from the "classic" sets. Most of them appear to be in good condition, although the Dragonite and Mr. Mime are peeling and the Alakazam and Ivysaur are warped (which usually is what happens to foil cards when left out). Collectors might pay quite a bit for those, or if you want, you can keep them as bragging tools.