Bronk Stone is available in the game start from 29 September 2020.
How to Unlock
Reach stage 6 in Yu-Gi-Oh! (ZEXAL) World.
Win 1 Duel against Bronk Stone while playing as Yuma and Astral
R Jewel x30
Perform 3 Xyz Summon(s).
Summon Warrior-Type Monster(s) 5 time(s) in total.
Complete all Character Unlock Missions.
Yellow Key x50
How to Get
Return of the Archduke At the beginning of the Duel, add 1 "Tin Archduke" to your Extra Deck. Can be used if your opponent controls a monster in defense position.Return 1 "Tin Archduke" from your Graveyard to your Extra Deck. This Skill can only be used once per Duel.
Overlay Gain Increase the ATK of 1 Xyz Monster you control until the end of the turn by the number of its Xyz Materials x 200. This Skill can only be used once per turn and twice per Duel.
Iron Aye Can only be used the turn you activated the effect of a card whose original name is "Aye-Iron". Increase the ATK of 1"Aye-Iron" you control by 400. This Skill can only be used once per turn and three times per duel.
Recycling Reserve Can be used if you have at least 2 more Machine-Type monsters than other cards in your Graveyard. All cards in your Graveyard other than Machine-Type monsters vanish. This Skill can only be used once per Duel.
I've Seen That Deck Before
Can be used if you and your opponent control a card/card(s) with the same name(s). Recover 500 Life Points for each different card with the same name. This Skill can only be used once per turn and three times per Duel.
Iron Call Can be used on your next turn after 'Iron Call' is activated, instead of conducting your normal draw. Return 1 'Iron Call' from your Graveyard to your hand. This Skill can only be used once per Duel.
3 Level 4 monsters Once per turn, during either player's turn: You can detach 1 Xyz Material from this card, then target 1 monster your opponent controls; change its battle position. (Flip monsters' effects are not activated.)
So wait, you mean the new voices of Bronk and Yuma are placeholders until the voice actors who dubbed them in the anime actually record the lines again with theirs? That´s weird. Why didn´t Konami contacted with them in the first place?