Yes. In Palworld v1.0.3, Xenolord can get Invader through currently verified methods: it is a fixed passive. Invader is a fixed passive on Xenolord in v1.0.3; every Xenolord has it. The facts behind this answer are graded B and come from 2 registered sources.
Reason
Element Boost Dark +30%; Element Boost Dragon +30%
Rank
4
Random pool
No
Other Pals
1
Xenolord breeding recipes
1
Fixed passives on Xenolord
2
Custom slots available
2
Verified evidence claims behind this verdict
2
Xenolord parent pairs with a direct source of Invader
1 of 1
Invader breeding route for Xenolord: 1 of 1 parent pair include a direct source (Xenolord).
Why
Invader is a fixed passive on Xenolord in v1.0.3; every Xenolord has it.
How Invader can be acquired on Xenolord in v1.0.3
Current method
Available for Xenolord?
Note
Fixed / innate
Yes
Invader is fixed on Xenolord — it is born with it.
Random pool (catch or hatch)
No
Invader: no verified rule puts it in the random pool for Xenolord.
Implant (Surgery Table)
No
Invader: no verified item method grants it here.
Breeding inheritance
Yes
Xenolord can inherit Invader along a verified breeding chain, under the standard passive-inheritance rule this dataset has not independently sourced.
Verdict per requested component on Xenolord in Palworld v1.0.3
Invader is a fixed passive on Xenolord in v1.0.3; every Xenolord has it.
B B · 2 sources
How it reaches this Pal
Invader is fixed on Xenolord — it is born with it.
Every Xenolord in v1.0.3 is born with Invader, so none of its 1 breeding recipe has to carry it.
What you can do now
Invader is fixed on Xenolord — it is born with it.
Alternative: Xenolord can inherit Invader along a verified breeding chain, under the standard passive-inheritance rule this dataset has not independently sourced.