Ah, good ol' times... My very first game was Ruby, I started it around, hmm, when I was 8? Not quite sure. My team for most of the game was:
Blaziken: My starter. I didn't liek Mudkipz very much at that time, and so Torchic was pretty much my first ever Pokémon. Also my second-ever Pokémon to reach lv 100.
Swellow: She looked fucking badass, and I had to catch it. I remember teaching her Hyper Beam :3. My fourth Pokémon to reach lv 100. She also killed Latios...by critting Peck. Fucking Peck. (And yes she still knew Peck at lv 100. why not )
Machoke: My third primary Pokémon, which soon became my strongest team member. I knew he would get four arms when he would evolve, so I trained him like hell... He was lv 100 before I reached Groudon, and he didn't evolve. Can you imagine? Grinding to lv 100 against Pokémon all between lv 30-45? After that he 1-hit KO'd Groudon, and pretty much swept in the League. He was my first ever lv 100.
Graveler: Caught this guy while derping and Rock Smashing around Mauville City. I don't think I used him much, the highest lv he reached was, I think, 63. He also never evolved.
Tentacruel: The second member of my team that didn't reach lv 100 and a primary HM slave. She was stuck with Surf, Waterfall and Dive. The level she reached was 85.
Rayquaza: The only team member that I caught after the League. Master Ball go. He was my third Pokémon to reach lv 100. Not much else to say about him.
Other Pokémon worth mentioning:
Beautifly and Dustox: I caught both of them as Wurmples in Petalburg Woods, but when they got beaten up pretty badly in the Rustboro Gym, they got boxed.
Zigzagoon: Caught him because he looked cool. He got boxed pretty soon, but hell Pickup.
Pelipper: I remember training a wild Pelipper I caught while Surfing, but I didn't use her much.
Girafarig, Ninetales and a hella amount of Vulpix: The first two Pokémon I used to breed. They made a lot of little Vulpix together. They were also the first Pokémon I used in the Battle Tower, together with a Medicham.
Sharpedo and Wailord: My secondary Water types. Taken out of the box long after the League to train.
Bellossom: I liked this little girl, and spent my only Sun Stone on her, only to accidentally trade her for a Corsola. I remembered Bellossom every day that year.