Once it was in the grave all was dandy, but not until then
Put a stun counter on that creature
Grab it before someone else does
Play the usual TeraZard line, evolve to put 2 Fire on Active and 1 on a backup Mander, take some knockouts, then before the first TeraZard gets KO'd (or if you have other ways to keep 4 energy in play, which Zard/Pidgeot should be able to do), evolve to a MegaZard and take out any opposing megas by dealing 380 damage
This is to say, playing an ample number of our plentiful archetypal Synchro monsters (and one Link!) is absolutely necessary
Fujishima 1 Card Yoichi Kotabe 1 Card Yoshimoto Yoshimon 5 Cards Yoshinobu Saito 110 Cards Yosuke Da Silva 3 Cards Youki Tanaka 1 Card Yousuke Hirata 9 Cards Yuichi Sawayama 6 Cards Yui Tanaka 1 Card Yuka Matsubara 1 Card Yuka Morii Ms