as someone had the exact same error by the TP Trainer here what Dekirai said:
Wrong IP Address
Trainer could not connect to the Wii U
TCPGecko isn't enabled
Wii U doesn't have internet
it could be one of these 4 things, you should recheck everything
Every trainer besides programs that edit the save file work over tcp (most with codehandler) so every trainer needs internet the BOTW Trainer always needed Internet
Well i found last time i was on gbatemp an initdata.bin editor and there you can change stuff like dmg,who owns the wep, etc or you can use an save editor if you want to edit the weapons you already have
Hey i tried this editor and its nice overall but i have a small problem when you need to save it says that i need to click that i understood it but when i pressed it nothing happened. I just tried (my friend wanted that) that i give the lvl 1 knights sword to ganondorf and i made it the exact...
Hey Hikari i just wanna let you know im 2 times in the hall of fame lul:iM|?Lenni? and lennart1911. you can remove 1 (idc which) and rename 1 to PikaArc .-.
Start HBL then launch the latest TCP Gecko with the codehandler then start botw (be sure you are at the latest vers) and then connect with the trainer done.
if any other problems happens explain it lul