Training

Training Mode is a game mode in Super Smash Flash and Super Smash Flash 2 where you can train on a character without stocks but with scores. You can control the characters motions, making it it a CPU or Human Controlled, or simply making it motionless and you can spawn various items.

In Super Smash Flash
This mode is based off the Training Mode in all Smash Bros. games. However, the mode is only limited to those characteristics prior mentioned; unlike in the Smash Bros. games, where you could also control gameplay speed, and alter the number of player on screen without ever having to leave the match, set off a help menu, etc.

In Super Smash Flash 2
According to the official SSF2 FAQ, the Training Mode has been confirmed to return in SSF2, but it hasn't been programmed into the game, yet.