This tip helped me clear Ultimate Cup Z in Kirby and the Forgotten

The Morpho Knight Sword has an easily overlooked ability that can help you clinch the Ultimate Cup Z trophy in Kirby and the Forgotten Land.

Extra Mode, Kirby Wiki

Ultimate Cup Z Guide: Boss List and Recommended Abilities

Colosseum Guide: How to Unlock the Colosseum and Recommended Abilities

Kirby and the Forgotten Land Developer Admits the Final Boss Difficulty Might've Been 'a Bit Too Steep' : r/NintendoSwitch

Kirby and the Forgotten Land: All Waddle Dee Town Upgrades

Waddle Dee Town, Kirby Wiki

How to Beat the ULTIMATE CUP Z Kirby and the Forgotten Land

Waddle Dee Town, Kirby Wiki

Ultimate Cup Z Guide - Kirby and the Forgotten Land Guide - IGN

Ultimate Cup Z Guide - Kirby and the Forgotten Land Guide - IGN

Figure - WiKirby: it's a wiki, about Kirby!