Changes

In order to challenge [[Tyranno Hassleberry (Duel Links)|Tyranno Hassleberry]], the player must be at Stage 4 or higher. Additionally, they must spend Dinosaur Fossils in order to challenge Hassleberry. The player earns Dinosaur Fossils when they Duel in Duel World (except at the [[Gate]]) or in [[Ranked Duel]]s, with these earning more Dinosaur Fossils being earned from winning Duels against Standard/Legendary Duelists (and if they win; the amount of Dinosaur Fossils earned being is dependent on which Stage the player is currently at). Whenever players earned Dinosaur Fossils this way, they also received 10 bonus Dinosaur Fossils the first two times this occurred each day's current Stage. If the player Duels a Standard Duelist with a Reward Multiplier, the number of Dinosaur Fossils earned will be multiplied by the same amount (except for the bonus Dinosaur Fossils). The first two times per day the player earns Dinosaur Fossils by Dueling, they also receive 10 bonus Dinosaur Fossils.

At firstAfter defeating Hassleberry once in Duel World, Hassleberry he will only be able to be challenged appear at the Event Gate at Level 10. To challenge him at higher Levels (up to Level 40), the player needs to defeat him at least once at the highest available Level at the Gate (e.g. he needs to be defeated at Level 10 before he can be challenged at Level 20). Hassleberry can appear at any level in Duel World, even if the player hasn't unlocked that Level at the Gate yet, and defeating him in Duel World will not unlock new Levels at the Gate. In order to challenge Hassleberry at the Gate at a certain Level, the player needs to spend a corresponding amount of Dinosaur Fossils, which is as follows:

Starting part-way through the event (starting March 1, 2019 during the March 2019 run, starting June 13, 2019 during the June 2019 run), Hassleberry can appear in Duel World (GX) as "Ultimate Tyranno Hassleberry", as long as the player has unlocked Tyranno Hassleberry at the Event Gate. While Ultimate Tyranno Hassleberry is present, Tyranno Hassleberry will not appear in Duel World, but can still be Dueled at the Gate. Ultimate Tyranno Hassleberry always goes second. Ultimate Tyranno Hassleberry uses the Skill "Rampage", which forcefully ends the Duel at the start of his 5th turn (as a [[DRAW|draw]] in the June 2019 run, or by winning the Duel himself in the March 2019 run); due to the player always going first, this always occurs at the start of 10th turn of the Duel.