I'm sorry to say, but that is not possible anymore. Back then, we were able to hack the Scenario Missions. For example, we could set the number of mystery boxes we got, we could "round-skip", we could spam the rewards system, and all that good jazz! Now, all those hacks are patched because almost everything regarding the Scenario Missions are SERVER-SIDED... which means that you would have to hack into their server to change anything. Let me remind you that hacking into their servers is illegal, so I don't recommend trying! I hope that I helped.