The description of this card’s misleading. It doesn’t specify that it can’t be activated during battle phase. Tried it out against a Hand thief deck and it didn’t activate during the response of Rising energy.
Other cards can be activated during the battle phase. You're wrong. Shockwave is misleading. It's a trap why not activate it like other traps during the battle.
Because you tried to activate it during the Damage Step, when the game's rules forbid this card from activating in the Damage Step, since it's not a counter trap and it doesn't modifies ATK/DEF.
The above anon missed one more thing that can be activated in Damage Step btw, effects that negates can also be used in Damage Step. However, Psychic Shockwave does not negate.
Sorry but you are wrong, by your logic traps like call of the haunted or mirror force can't be used during the battle phase either. As long as a trap meets the summon criteria it doesn't matter if it's speed 2 or speed 3 it can be used during the battle phase. As it's not working in duel links for this trap it's either bugged or not implemented correctly.
There are restrictions on what can be used in the Damage Step. Does Psychic Shockwave alter ATK/DEF? No. Is it a Counter Trap? No. Is it a Quick Effect Monster? No. Does it say it can be used in the Damage Step? No. Thus, it cannot be used in the Damage Step.