Yes. In Palworld v1.0.3, Necromus can get Legend through currently verified methods: it is a fixed passive. Legend is a fixed passive on Necromus in v1.0.3; every Necromus has it. The facts behind this answer are graded B and come from 2 registered sources.
Reason
Attack +20%; Defense +20%; Movement Speed +15%
Rank
4
Random pool
No
Other Pals
6
Necromus breeding recipes
1
Fixed passives on Necromus
2
Custom slots available
2
Verified evidence claims behind this verdict
2
Necromus parent pairs with a direct source of Legend
1 of 1
Legend breeding route for Necromus: 1 of 1 parent pair include a direct source (Necromus).
Why
Legend is a fixed passive on Necromus in v1.0.3; every Necromus has it.
How Legend can be acquired on Necromus in v1.0.3
Current method
Available for Necromus?
Note
Fixed / innate
Yes
Legend is fixed on Necromus — it is born with it.
Random pool (catch or hatch)
No
Legend: no verified rule puts it in the random pool for Necromus.
Implant (Surgery Table)
No
Legend: no verified item method grants it here.
Breeding inheritance
Yes
Necromus can inherit Legend along a verified breeding chain, under the standard passive-inheritance rule this dataset has not independently sourced.
Verdict per requested component on Necromus in Palworld v1.0.3
Legend is a fixed passive on Necromus in v1.0.3; every Necromus has it.
B B · 2 sources
How it reaches this Pal
Legend is fixed on Necromus — it is born with it.
Every Necromus in v1.0.3 is born with Legend, so none of its 1 breeding recipe has to carry it.
5 of 6 shown
What you can do now
Legend is fixed on Necromus — it is born with it.
Alternative: Necromus can inherit Legend along a verified breeding chain, under the standard passive-inheritance rule this dataset has not independently sourced.