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You can also move after receiving rewards, so you can split the Super Mokoko Express rewards between 2 characters.

Complete rewards are also possible. So, if you have a 1600 character, you can receive the complete reward on the 1600 character and move it to

You can give the remaining rewards to your alt.

If your main is around 1600 and your alt is 1540, you can give the 1610 achievement box to your main and transfer the remaining rewards to your alt to transfer the enhancement probability buff and materials.

As in the picture above, receive the final reward on your main 1607 Hawkeye and transfer the complete box to

You can transfer it to a 1580 Scouter. (Gems and other provided equipment go to the Super Mokoko Express character that has been changed.)

By transferring the remaining boxes to your alt and receiving the materials to use up to 1600, you can get more efficient rewards.

You can change characters by pressing the button on the bottom left (only possible once).
You can even receive the box with Blessed Stone and Superior Oreha Fusion Material.

If you have a 1600 main and a 1540~80 alt and want to level up your main, you can use the above method to level up your alt more efficiently.

Or, if your main is 1600 but you have a hard time bringing your alt from 1540 to 1600, you can feed the complete reward to your main to get the rewards first, and if you level up your alt as much as possible, you can receive the complete reward even if your alt doesn't reach 1600.

The Challenge Mission goes to the character receiving the Super Mokoko Express at the end.