Bugs:

• you probably wanted to start with x=0since you referenced that in the code
• start the for with {
• x++ instead of x+=
• else if instead of elseif
• added missing }
• console instead of consle

function bug_hunting () {
   for (var x=0; x <= 5 ; x++) {
      if (x === 0) { console.log(x +  " is zero"); }
      else if (x % 2 === 0) { console.log(x + " is even"); }
      else { console.log(x + " is odd"); }
   }
}
bug_hunting();

and the output:

0 is zero
1 is odd
2 is even
3 is odd
4 is even
5 is odd