The older pokemon fans i saw are often minmaxing douchebags with hillarious builds no standard pokemon team can even dent.
Once someone had a Magikarp oneshoting everything i had after a short setup i pretty much couldn't prevent nless i had just the right team.
I so gave up and went back to playing TF2 and Navyfield.
No, you see, the fun comes in when you murder said teams with naught but a shitty coelacanth and a bipedal cow. The Magikarp passing team is easily stoppable via many methods.
1. Ghost type pokemon. Tackle can't hit you.
2. Haze removes all stat boosts
3. Kill whatever is going to pass the boosts. (Or at the least, make it impossible to switch out.)
4. Use Roar or something to make the magikarp switch out and lose all its boosts
5. Use a focus sash/sturdy pokemon, tank the hit, and kill it in one hit.
6. Just kill it when it switches in
etc, etc, etc.
Gimmicky teams aren't fun to play against. There are two types of teams I like to fight.
A. Well made teams, or at least balanced ones, that require a varied strategy to beat. Standard fare.
B. HOLYBALLSWHAT teams, or on Smogon, Ubers Tier. This is the team with the Arceus, Blaziken, Kyogre, and other ridiculously powerful Pokemon. The fun comes in trying to beat these teams with as weak of a team as possible. A lot of people like this lead with a Deoxys-A or Deoxys-S, two really fast psychic types without a lot of defense. They like to set up entry hazards, especially when they think their opponent can't kill them in one hit. If their opponent can, they like to use their ludicrous attack power to remove the threat. Cue Psychic or some other high-powered Psychic move, come to tear my Sawk a new one. He holds on with his Sturdy special ability, uses Payback (super effective, bonus damage for going second) to completely obliterate the enemy lead. Their entire strategy off course, you proceed to disorient them with a Miltank. What moves to use? They don't know, they've never fought a Miltank with a Giratina! (And quagsire/relicanth's double weakness to grass combined with miltank's boosted attack when hit by a grass move makes for fun switches.)
I am an unabashed challenge mode power gamer.