Just browse the alternate special attack for any character like that.
Neutral B 1: Energy ball blaster (default). The normal one that shoots slowly with a slight vertical knockback.
Neutral B 2: Energy ball blaster (chargeable). This functions like Lucario's neutral-b, but Tails can walk around the stage.
Neutral B 3: Energy ball blaster (spameable). Faster and does more damage than the default one, however it has a long startup-lag.