I'm on 1.1, for 1.0, try
00756F0B 00000000
Also, gamefaqs has a pretty good Guide with a good deal of info. Like which monsters are behind which gates, when you can get the, etc.
https://gamefaqs.gamespot.com/3ds/726426-dragon-quest-monsters-2-iru-to-ruka-no-fushigi-na-fushigi-na/faqs/71935