When I first got into the game back in 1997, I mainly just collected and traded. I never built an actual legit deck, so that doesn't count. My first deck(since getting back into the game back in June) was a random conglomeration of Infernape PL, Houndoom GE, and Magmortar SW, with the Lv. X.
I believe I also somehow found a way to squeeze Heatran Lv. X in there.....yeah. Very overcrowded. I eventually thinned it down to pure Infernape, but i swapped some of the PL's out for MD's cuz i got sick of flipping tails. I then put PL back in because I got sick of always having to discard ALL the energy on Infernape MD, even if all i wanted to kill was a Sableye! I've since taken the deck apart due to it no longer being legal, and the fact that i could never make it flow as smoothly as I wanted it to.
I've also somehow combined Magmortar SW and a 4-4-1 line of Machamp SF into a deck that ACTUALLY WORKED for a period of time....and no Azelf either. Still dumbfounds me to this day how well it actually worked. Then again, I was playing Tangrowth AR and Electrode SF as my 2 friends leads....yeah fun times. I eventually realized that MagMachamp, as i came to call it, wasn't working anymore. So, I removed Machamp and paired it with.......Tangrowth SF......no synergy whatsoever, but it worked at the time LOL.