Magnet Spikes came after every monster in the game except Bogabadorumu and the Zeniths for Gravios, Baruragaru, Taikun Zamuza, Harudomerugu and Twinkling Zerureusu. Nothing in the game is realistically designed around their use.
Shitens were G5 content. Duremudira was a G6 monster. 2nd District Duremudira was a G8 monster. All of them were killed in era regularly. Inlcuding solo. This is without Zenith Skills, Extreme Style, Hiden Cuffs and all the other insane power creep that came during the Z cycle.
All files people could reasonably want are already on archive.