Making an entity not despawn

ok so new problem
I want my entity to not despawn at all
but cobblemon made it difficult
is there a way for me to run the /data merge command with {PersistanceRequired:1b} but only on the entity that spawns on the armor stand?
like maybe by executing a command using @n for near entities
execute as @e[type=armor_stand,name="Spawn"] at @s run data marge @n {PersistenceRequired:1b}
kill @s[type=armor_stand,name="Spawn"]```

I did this but I it didn't work
I think my logic is wrong somewhere