PNAT in ASA after os version 8.6:
object network obj-Telnet-Inside-172.30.129.254
host 172.30.129.254
nat (inside,outside) static interface service tcp 22 50000

access-list Internet-Out-IN extended permit tcp any any eq ssh
access-list Internet-Out-IN extended permit icmp any any
access-list Internet-Out-IN line 3 extended permit tcp any any eq 50000
access-list Internet-Out-IN line 4 extended permit ip any host 172.30.129.254

pay attention:
Host should be internal IP address of the server
and interface command means wan IP address, you can type other WAN ip