Can you farm pink ore from keeping anglers?
maybe it is possible, i will try it
You can't. Need to kill them or the Corrupted Lizard in the Chaos Cave.
where to get giant natives like this?
use search, you can get them from lvl 100+ raids if you place flower totem at your base
They replace Large Male Natives when you have Flower Totems (craft at Plant Workbench). Higher chance of replacement with more flower totems. They don't need high level raids to appear; just need a large enough raid group. 10 enemies with around 6 flower totems should nearly guarantee the appearance of one, even at raid Level 1+0. Or 20 enemies with 3~4 flower totems.
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As for raid levels...
A raid level modifier of at least +10 will start spawning elite Male Natives, which can drop Fighter Orbs you need to "tame" the Large Female Natives. Flower totems have a chance of replacing Male Natives with Female Natives. Elites will be replaced with elites.
A raid level modifier of at least +20 will start spawning elite Large Male Natives and elite Small Natives. Flower totems have a chance of replacing them with Large Female Natives and DLC females. Elites will also be replaced with elites.
For raids with a modifier of at least +20, the first raider spawned is guaranteed to be an elite Large Native, either male or female with the chance depending on how many flower totems you have.
The actual location-based level (the number on the left of Lv X + Y) doesn't matter. The only thing that matters is the raid adjustment level on the right that you get by putting down Angry Pots or Hell Totems or Debris and the like.