Turn off analog comparators so your pins can be used for digital I/O.

CMCON = 7

PULSOUT toggles the pin twice, so the initial state of the pin determines
the logic of the pulse.

LOW 0 ' We want a high-going pulse or low-high-low with pulsout.

Code:
@ DEVICE MCLR_OFF,INTRC_OSC,WDT_OFF,PROTECT_OFF

Define	OSCCAL_1K 1  ' Load factory value into OSCCAL
CMCON = 7                  ' Turn analog comparators off

X VAR BYTE
LOW 0        ' Setup GPIO,0 to output a high-going pulse with pulsout

Main:
    FOR X = 1 to 50
    pulsout 0, 100
    pause 15
    NEXT X
    
    pause 1000
    
    FOR X = 1 to 50
    pulsout 0, 200
    pause 15
    NEXT X
    
    pause 1000
    
    goto Main

    end
You may want to tweak the pulsout periods, but that should get you started.

Make sure you use a separate power supply for your servo. Using the same PS as the PIC will cause problems.