Well, there's a Trainer (almost identical to the one from Ruby), a Berry (probably the HPBerry from Ruby but in FRLGE format), a Mystery Event (TM01 from Norman) and an Unown V that gets added to your party.
201-21 - TOURNAMENT - 971FCACB27AD.pk3 Debug Berry - ガイブのみ.ecb Debug Trainer - カードイー.ect Debug TM01.me3
Edit:
Here's more, this time from the Japanese Debug version of Pokemon Diamond that leaked last year.
The first three Pokemon (Infernape, Piplup and Finneon) are added to the party when the game is started through a debug option instead of the regular way.
Then, ingame you have 3 options that will give you some Pokemon.
The first adds all three forms of Burmy to your party, the second fills the first box with Slowpoke (all of them beeing clones) and the third one fills all the boxes with Slowbro (each of them differs in stats, nature and ability). Thanks to @jojo12100 for pointing out these exist.
412 - ミノムッチ - 4B4024D99F30.pk4 412-01 - ミノムッチ - 4B4824D99F30.pk4 412-02 - ミノムッチ - 4B5024D99F30.pk4
392 - ゴウカザル - C15504F530E7.pk4 393 - ポッチャマ - 6E6A773E7D20.pk4 456 - ケイコウオ - 832E0644668C.pk4
079 - ヤドン - F89398921D12.pk4 080 - ヤドラン - 174E010FE291.pk4