Judging from the screenshots, the majority of the sprites are downscaled from official art/frames from the anime with some editing afterwards.
It's very rude to level an accusation like that without any proof.
Oh you want proof my fellow Johto Bug-Type fan, well here ya go.
Firstly, a quote from the
Rom Hacks Studio Rules Post because all my arguements are gonna be based on this.
Explicit credits to the work of other members of the community, whether that be for art assets, music, custom code, maps, etc. The user which submits the thread should have contributed a significant amount of work to the ROM hack. ROM hack theft is not tolerated, and punishment falls under the global PokéCommunity rules for plagiarism.
So here's how this game violates every single rule about credits
Exhibit A: Fighters Sprites
https://www.spriters-resource.com/game_boy_advance/dbzsuperwar/
This is the Spriters Resource page for DBZ Supersonic Warriors. Team Training (which I'll refer to as DBZTT from hereon) uses sprites from here. Each and every sprite on this page has a tiny textbox saying "Please Credit XYZ for Ripping this Sprite" or something along those lines. Z-Max has done none of that and these sprites have been in the game since v1 so I don't know what is the excuse.
PS. There is definitely some Deviantart fanmade DBZ Supersonic Warrior Style sprites in the game. I'll uncover them and edit this post to include them. But let me get to my next point.
Exhibit B: Tools and Tutorials
The game definitely uses tutorials including, but not limited to, Adding New Moves, Adding New Move Particles, Adding New Tiles, using XSE for Eventing and using Sappy to add new Music.
If somehow Z-Max had the knowledge to add all of the above to DBZTT, he definitely used tools to edit the game and add things like Advanced Map for maps, XSE, Overworld Editor for new Overworld Sprites, Unlz for Sprite Editing, Advanced Sprites Series for adding Fighter Sprites, Nameless Tilemap Editor for adding Backgrounds and Move Particles, Advanced Pallete Editor for editing Pallettes, PGE/YAPE/G3T/G3HS for Pokemon Data Editing, Advanced Item Editor for Item Editing, Sappy for Music Editing etc.
And even if Z-Max was so skilled that he didn't need any of the above tools to make the game and could do it all by going in and editing the raw code of the game, he'd still need to credit the maker of HxD for the Hex Editing Tool to edit his game.
Exhibit C: Game Music
DBZTT uses multiple 16-bit renditions of actual Dragon Ball Z tracks. I'm not a 100% sure if these are tracks compressed into a GBA ROM or if they are fanmade recreations but I don't see credits to any fan or to Sappy so I don't know about this one.
Exhibit D: Careful Planning/Sheer Luck
So you may be asking, "Well UberDunsparce, the moderators approved of this thread so the creator definitely doesn't need to credit anyone." But you see this isn't an ordinary approved thread. Z-Max has (un)intentionally found a loophole in the ROM Hack Studio approval system.
So the game has been completed since 2015 ie the 1st post and after that most of the new versions have been new fighters, moves, etc. But the ROM Hack Studio thread for this game was never made. Since 2015, this game has been a game on the Launchpad Forum. Since most Hacks in the Launchpad Forum are just ideas/proof-of-concept demos, it allowed Z-Max to get away without crediting anyone for the game (even though the game was finished). It was doing good there.
But sometime ago, the thread was moved over to the ROM Hack Studio forum. I don't know if the creator asked for it because he wanted more visibility, or if a mod moved it because the game was completed, but that doesn't matter. The point is that,
since this was just a transfer from one forum to another, the game bypassed all moderator checking, validation and approval process, thus allowing this thread to not have any explicit credits. And that's why this thread has no credits.
Final Verdict
I don't have anything against the creator or the game. I love it, and am playing it right now. I'm on Mr. Satans Gym rn. But it really makes my blood boil when I see someone not crediting others for using their assets.
I don't want the game removed or anything. I just want Z-Max to add a simple credits section where he has the name of every single tool/tutorial/sprites he has used in the game, even stuff like Paint.NET. Not many people want to see a super fleshed out Fighters and Tips section in your main post, but many would appreciate it very much if you added a teeny tiny spoiler with the credits inside it. And while we're on the topic of the Tips Section, could you sort it out and move it into a spoiler too. Thank You.