Allowed
All weapons (swords, lances, axes, guns, knifes, bombs, rods).
All equipment (radars, sensers, armor & shield, any sort of clothing).
All items/food (berries, pokeballs, triforce, potions, collection items, power-ups).
All Vehicles (space ships, cars, machines, sea ships).
Wishing (whether with the use of a item or not, wishing is allowed).
TMs (Pokemons are able to obtain TMs by themselves, thus allowed them).
Disallowed/Banned
Back-up (other characters in the same series group [whether good or bad, a part of the gameplay or not] are disallowed to aid said smash character, but there are some exception to this rule; the exceptions are Navi, Pokemon Trainer's pokemons, Gods & Goddesses, and live like power-ups).
Game hacks (hacks are banned for obvious reasons).
Game freeze (as like hacks, game freeze is banned).
National Pokedex (If I allow Pokedex, problems will start to arise, a example of this may be: Charizard has said to breath Fire that is enough to melt rocks. Which of course makes no sense considering fire attacks are not very effective against Rock.)
Game mechanics (If something is described about a certain character in his or her game that isn't ridiculous [like Pokedex entries], then it is a true fact about said character. If something as stupid as, let's say, Link shoots an arrow towards the sun, the arrow then returns as a fire arrow, this becomes a game mechanic because nothing was said that describes so.)
Restrictions
Wishing to win (while wishing is allowed, wishing to win is simply banned).
Super Sonic (Sonic can stay super for 2 hours, 46 minutes and 30 seconds, it's explained why in
this post).
I'm going to add this to the front page, hope this stops some questions from arising. I'll add/edit more, the more we move along.