Will update this deal post when new codes become available daily.
Note: 1000 Fusion Energy is required to fuse.
Day 1 - 50 Volt Fusion Energy
Volt Fusion Energy is used to fuse Kyurem and Zekrom. Trainers can earn Volt Fusion Energy from Black Kyurem raids this weekend.
Code: WJ5DFWASCL65W
Redemption Link
Day 2 - 50 Blaze Fusion Energy
Blaze Fusion Energy is used to fuse Kyurem and Reshiram. Trainers can earn Blaze Fusion Energy from White Kyurem raids this weekend.
Code: RCC4AJPAUCW86
Redemption Link
Day 3 - 50 Volt Fusion Energy
Code: ABJXJET8MYW7T
Redemption Link
Day 4 - 50 Blaze Fusion Energy
Code: C352CNMG77474
Redemption Link
Worth noting you need 1000 Fusion Energy each to be able to fuse Kyurem with Zekrom and Reshiram, so 50 is a very small credit towards it. You'll get more by raiding this weekend during the GO Tour Unova global event.