From Dragon Ball Wiki, the ''Dragon Ball'' encyclopedia
Blast 1 (often abbreviated B1 or Special Attacks even in the games) is a form of technique in the Budokai Tenkaichi video game series that can do a variety of things; from boosting a character's stats, to fully charging their Ki. The Blast 1 techniques vary with the character and are performed by either pressing the [Ki Charge] and [Guard] buttons or the [Ki Charge], [Up], and [Guard Buttons]. Unlike Super and Ultimate attacks, Specials Attacks consume Blast stocks rather than Ki (except in Dragon Ball: Raging Blast where these also consume Ki). Most Blast 1 techniques fall under these categories:
 [Attack] enhancers
These Blast 1s will boost the physical strength of a character for either a short period of time or until a Blast 2 attack is used. Usually, another stat is boosted as well. Examples are Finish Sign and I'll Beat You in 5 Seconds!.
 [Defense] enhancers
These Blast 1s will reduce the user's likeliness to be stunned and the damage they take from their opponent's attacks. False Courage is a prime example, but these techniques usually only last for a few seconds.
 [Ki] enhancers (High Tension type)
 [Blast] enhancers
 Barrier type
These Blast 1s will shield the character in a barrier of Ki, and allows the character to counterattack. Explosive Wave will only shield the character from small Ki Blasts, Physical attacks, and Rush attacks. B1s with the name "Barrier" will also shield the character from B2s/UBs, but have longer lag after being produced.
 Paralysis type
These Blast 1s will temporarily freeze the character as if they were hit by a heavy attack. This allows the user to pretty much do whatever s/he wants to the victim during their paralysis. Telekinesis and Demon's Eye are some examples.
 Ki Regaining type
 MAX Power type
These Blast 1s instantly give all of the Ki back to the user AND put them in MAX Power mode. There is, however, a huge handicap to this technique as once MAX Power is gone, the character is left with VERY low Ki charging speed. For some characters, another stat or two is usually boosted in addition. Power up to the Very Limit and Super Unyielding Spirit are good examples.
 All Stat Increase type
 Teleportation type
These Blast 1s are moves that involve the use of Rapid Movement to dodge an attack. Afterimage simply allows the user to automatically dodge an attack, and up to 3 can be stored at a time. Afterimage Strike is like Afterimage, but when it is stored, the user uses the afterimage for 15 seconds after its stored . As many can be stored as desired, but the user is left with low Ki charging speed. Wild Sense will automatically dodge an attack and automatically counterattack that attack, but only one can be stored. Instantaneous Transmission can be used at will, and causes the user to transport right behind their opponent. It breaks the victim's Lock-On as well, but has a few seconds before actually performing the attack, making timing important.